Fabbisogno Calorico

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  • MaxBodyBuilder
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    #46
    Originariamente Scritto da flex wheeler
    Non che sia brutta quest'immagine....ma preferivo quella vera!!
    You cannot replace a legend. You have to create your own!

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    • MaxBodyBuilder
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      #47
      Originariamente Scritto da MaxBodyBuilder
      Non che sia brutta quest'immagine....ma preferivo quella vera!!
      ...l'hai cambiata...dov'è andata a finire la donna con il pelo?
      You cannot replace a legend. You have to create your own!

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      • MaxBodyBuilder
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        #48
        ...alcune incertezze...

        Seguitemi passo a passo,perchè non ho capito un punto di questo sistema per il calcolo del fabbisogno calorico...

        1) Determina il peso corporeo, meglio se a digiuno dopo essere andato al bagno.
        173

        2) Determina il gruppo morfologico a cui appartieni: si ottiene dividendo la statura in cm per la circonferenza del polso, successivamente si ricava il tipo morfologico a seconda dell'indice morfologico (I.M.) ottenuto dalla seguente tabella:

        TIPO C I-M Uomo
        Tipo 1 1 >10,4
        Tipo 2 2 Tra 10,4 e 10,1
        Tipo 3 3 Tra 10,1 e 9,8
        Tipo 4 4 Tra 9,8 e 9,5
        Tipo 5 5 < 9,5

        TIPO C I-M Donna
        Tipo 1 1 >10,9
        Tipo 2 2 Tra 10,9 e 10,6
        Tipo 3 3 Tra 10,6 e 10.3
        Tipo 4 4 Tra 10.3 e 9,9
        Tipo 5 5 < 9,9
        173 / 18 = 9.61 , quindi sono del Tipo 4 4 ---->che significa?

        3) Determinazione del peso ideale (P.I.): si calcola attribuendo alla "costituzione" un valore "C" della tabella sopraindicata, inserendo i dati nella formula che segue ed adattandoli a seconda dell'età.
        Il seguente procedimento di calcolo è utile solo a coloro che volessero rientrare negli standard di peso statisticamente normalizzati.
        Non è questo il caso di un bodybuilder: nel nostro caso il peso deve essere stabilito a priori. Un bb che volesse passare da 80 a 90 Kg dovrebbe assumere come P.I 90 Kg


        P.I UOMO = (staturax0,72)+(C x 4,3) – 66

        P.I DONNA = (staturax0,65)+(C x 4,2) - 58


        -adattamento per età-

        < 25 togliere 0,5 Kg ogni anno sotto i 25 anni
        > 55 togliere 0,2 Kg ogni anno sopra i 55 anni
        Qui non ho fatto calcoli...mi sono prefissato l'obiettivo degli 80 kg, quindi P.I. = 80 kg


        4) Determinazione dell'indice di massa corporea (IMC): si calcola il rapporto tra il peso reale e il peso ideale e si valuta lo stato di peso in cui ci si trova.
        In seguito si valuta l'apporto calorico\Kg di peso ideale secindo la seguente tabella:

        BMI

        0,7: 28 cal\KG p.i.
        0,8: 25,75 cal\KG p.i.
        0,9: 23,50 cal\KG p.i.
        1 : 21,25 cal\KG p.i.
        1,1: 12 cal\KG p.i.
        1,2: 16,75 cal\KG p.i.
        1,3: 14,5 cal\KG p.i.
        1,4: 12,25 cal\KG p.i.
        1,5: 10 cal\KG p.i .
        con peso ideale 80 kg ottengo 0,9125, quindi 23.50 cal/KG

        5) Determinazione del fabbisogno giornaliero di base (MB): rappresenta la somma dell'energia utilizzata per compiere lavori interni necessari all'organismo.
        Si calcola moltiplicando il peso ideale per il numero di cal\Kg di peso ideale che varia a seconda del BMI ottenuto
        80*23.50 = 1880

        6) Determinazione del fabbisogno per attività lavorativa svolta: il valore calorico di base va aumentato in funzione dell'attività fisica svolta: leggera=0,3, media=0,4, media-pesante=0,5, pesante=0,65

        Leggera: Impiegato, insegnante, disegnatore, sarto, studente
        Media: Cameriere, calzolaio, terziario, casalinga
        Media-pesante: Meccanico (auto), cuoco, elettricista
        Pesante: Carpentiere, metalmeccanico, muratore

        Quindi si moltiplica il fabbisogno basale per la cifra indicata e la si aggiunge per trovare il fabbisogno calorico totale
        supponendo la mia attività "media=0,4" devo eseguire questo calcolo? (23.50+0.4)*80 = 1912
        o che calcolo?...non capisco la frase sopra...e poi 1912 kcal mi sembrano pochissime....li dice che devo moltiplicare il fabbisogno basale(1880)per la cifra indicata(penso 23.90)e la si aggiunge...aggiunge a che cosa?!?!?

        7) Determinazione dell'azione termogenica indotta dai cibi (TDI): rappresenta l'incremento del dispendio energetico in risposta all'assunzione degli alimenti. Lo stimolo termogenico maggiore è dato dalle proteine e dagli aminoacidi (10-35% dell'energia ingerita), mentre valori inferiori sono attribuibili ai carboidrati (5-10%) e lipidi (2-5%)
        Per calcolare la termogenesi indotta dalla dieta si può aumentare il fabbisogno per l'11% (metodo approssimativo).
        Un metodo più preciso deve prendere in considerazione l'apporto derivante dai singoli macronutrienti e consiste nell'aumentare detti apporti calorici secondo la seguente tabella:

        TDI
        0,225 Proteine
        0,075 Carboidrati
        0,035 Grassi

        Quindi avrete trovato il vostro fabbisogno calorico quotidiano totale.
        cosa vuol dire sta cosa??praticamente le proteine inducono il corpo ad un utilizzo maggiore di energia al fine di essere utilizzate?
        Quell' 11% (valore generico) deve essere aggiunto al valore basale(nel mio caso 1880,che poi subisce ancora altri calcoli.....)oppure alla quantità di calorie totali???
        Grazie.
        You cannot replace a legend. You have to create your own!

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        • flex87
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          #49
          TIPO C I-M Uomo
          Tipo 1 1 >10,4
          Tipo 2 2 Tra 10,4 e 10,1
          Tipo 3 3 Tra 10,1 e 9,8
          Tipo 4 4 Tra 9,8 e 9,5
          Tipo 5 5 < 9,5

          TIPO C I-M Donna
          Tipo 1 1 >10,9
          Tipo 2 2 Tra 10,9 e 10,6
          Tipo 3 3 Tra 10,6 e 10.3
          Tipo 4 4 Tra 10.3 e 9,9
          Tipo 5 5 < 9,9

          3) Determinazione del peso ideale (P.I.): si calcola attribuendo alla "costituzione" un valore "C" della tabella sopraindicata, inserendo i dati nella formula che segue ed adattandoli a seconda dell'età.
          Il seguente procedimento di calcolo è utile solo a coloro che volessero rientrare negli standard di peso statisticamente normalizzati.
          Non è questo il caso di un bodybuilder: nel nostro caso il peso deve essere stabilito a priori. Un bb che volesse passare da 80 a 90 Kg dovrebbe assumere come P.I 90 Kg


          P.I UOMO = (staturax0,72)+(C x 4,3) – 66

          P.I DONNA = (staturax0,65)+(C x 4,2) - 58


          -adattamento per età-

          < 25 togliere 0,5 Kg ogni anno sotto i 25 anni
          > 55 togliere 0,2 Kg ogni anno sopra i 55 anni

          scusami il punto 3:
          cioè se io sono di tipo 1 al posto di C ci metto 10,4? o non ho capito niente?
          (il ke è possibile...)

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          • Yzf
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            #50
            Un metodo più preciso deve prendere in considerazione l'apporto derivante dai singoli macronutrienti e consiste nell'aumentare detti apporti calorici secondo la seguente tabella:

            TDI
            0,225 Proteine
            0,075 Carboidrati
            0,035 Grassi

            non ho capito questa cosa...potete spiegarmela per favore?

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            • T.N.T.
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              #51
              scusate una cosa.....ke non c'entra molto...ma kuali sono i rischi di una dieta troppo ipocalorika?? parlo di circa1000 kcal al giorno....

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              • The_Q
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                #52
                semplicemente bruciando molto più di quelle 1000 calorie introdotte deteriorerai tantissimo i muscoli...

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                • Cybermod
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                  #53
                  ragazzzi,a me esce un fabbisogno di circa 1600 kilocalorie per poter arrivare al peso forma di 66Kg da 75 che ne sono.Sono cmq un pò poche secondo me,potete aiutarmi a capire se non abbiamo sbagliato a fare i conti??

                  Addirittura due volte mi sono uscite fuori cose da 7000K calorie.....mha,brutta bestia l'ignoranza ma anche la matematica fa la sua bella figura!!!

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                  • FrAnZ
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                    #54
                    Errata corrige

                    Originariamente Scritto da Gawain

                    BMI

                    0,7: 28 cal\KG p.i.
                    0,8: 25,75 cal\KG p.i.
                    0,9: 23,50 cal\KG p.i.
                    1 : 21,25 cal\KG p.i.
                    1,1: 12 cal\KG p.i. <---
                    1,2: 16,75 cal\KG p.i.
                    1,3: 14,5 cal\KG p.i.
                    1,4: 12,25 cal\KG p.i.
                    1,5: 10 cal\KG p.i .

                    ERRATA CORRIGE!

                    BMI

                    0,7: 28 cal\KG p.i.
                    0,8: 25,75 cal\KG p.i.
                    0,9: 23,50 cal\KG p.i.
                    1 : 21,25 cal\KG p.i.
                    1,1: 19 cal\KG p.i. <---
                    1,2: 16,75 cal\KG p.i.
                    1,3: 14,5 cal\KG p.i.
                    1,4: 12,25 cal\KG p.i.
                    1,5: 10 cal\KG p.i .

                    ...per tutti coloro ke sono in lieve sovrappeso come me... e hanno avuto un coccolone nello scoprire ke dovevano assumere poco più di 1300 kcal/die.

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                    • Cybermod
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                      #55
                      si vabbhè,ma a me non cambia niente: il conto non mi esce mai!!!!!! stupide formule matematiche!!

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                      • DaKid13
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                        #56
                        Allora:
                        Peso reale 78 Kg

                        Gruppo morfologico:

                        186cm/17polso= 10,94= tipo 1

                        Peso ideale: (186* 0,72)+ (1? * 4,3)- 66= 133,92+22,79 - 66= 90,71

                        Ho 24 anni...- 0,5= 90.21

                        Può essere mai questo il mio peso ideale???

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                        • alexxxmo
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                          #57
                          allora.. 76.5kg...

                          175/17=10.29 percui tipo 2 2 giusto?

                          P.I UOMO = (staturax0,72)+(C x 4,3) – 66
                          P.I UOMO = (175x0,72)+(2 x 4,3) -66 = 126+8,6 -66 giusto? =68.6

                          imc 76.5/68.6= 1.1151ecc percui.. azz e' sbagliato .. quant'era? 18 19??

                          beh facciamo 18 per 68.6=1235kcal al giorno solo per vivere giusto?
                          'mo faccio il muratore, devo aggiunre 0.65 giusto? posso fare 1235x1.65?
                          che farebbe..2038... mm
                          mi sembrano poche..
                          1235x0.65=802.75.... + 1235= 2038.. boh..
                          2038x11%=2262...

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                          • alexxxmo
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                            #58
                            Originariamente Scritto da alexxxmo
                            allora.. 76.5kg...

                            175/17=10.29 percui tipo 2 2 giusto?

                            P.I UOMO = (staturax0,72)+(C x 4,3) – 66
                            P.I UOMO = (175x0,72)+(2 x 4,3) -66 = 126+8,6 -66 giusto? =68.6

                            imc 76.5/68.6= 1.1151ecc percui.. azz e' sbagliato .. quant'era? 18 19??

                            beh facciamo 18 per 68.6=1235kcal al giorno solo per vivere giusto?
                            'mo faccio il muratore, devo aggiunre 0.65 giusto? posso fare 1235x1.65?
                            che farebbe..2038... mm
                            mi sembrano poche..
                            1235x0.65=802.75.... + 1235= 2038.. boh..
                            2038x11%=2262...
                            +quant'era per il punto 1.1?mmm trovato!! 19...
                            19x68.6=1303 che X 1.65=2150 che piu' 11%=2387
                            giusto?
                            questo se da 76.5 che sono vorrei arrivare a 68.6?
                            come e' meglio dividerla in % secondo voi?

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                            • Manchester
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                              #59
                              x i moderatori se potete aggiungere in testa al 3d

                              Volevo regalarvi questa parte di articolo estratto, da un documento trovato su Internet stilato da Tom Venuto.

                              Ci da qualche indicazione in + su come calcolare i nostri introiti calorici in base alla massa grassa.


                              ActLivello di attività
                              Sedentary = BMR X 1.2 (little or no exercise, desk job)
                              Lightly active = BMR X 1.375 (light exercise/sports 1-3 days/wk)
                              Mod. active = BMR X 1.55 (moderate exercise/sports 3-5 days/wk)
                              Very active = BMR X 1.725 (hard exercise/sports 6-7 days/wk)
                              Extr. active = BMR X 1.9 (hard daily exercise/sports & physical job or 2X day training, i.e marathon, contest etc.)


                              Katch-McArdle formula (BMR based on lean body weight)
                              Questa formula permette di fare una stima del BMR, in base al valore della massa grassa, una volta acquisito.
                              La formula è valida per entrambi i sessi.
                              BMR (uomo/donna)= 370 + (21.6 X lean mass in kg)
                              Example:
                              Es. Donna
                              peso: 54.5 kili
                              Massa Grassa 20%
                              Massa Magra = 43.6 kili
                              BMR = 370 + (21.6 X 43.6) = 1312 calories

                              Per determinare il TDEE basta moltiplicare il BMR per l'Activity Multiplier
                              ES.
                              BMR = 1312
                              Livello di attività moderato (all 3-4 volte a settimana)
                              fattore di attività = 1.55
                              TDEE = 1.55 X 1312 = 2033 calorie

                              Personalizzare le Calorie in base ai propri obiettivi
                              Una volte calcolato il TDEE (livello di mantenimento), occorre modificare le calorie in base al proprio obiettivo.
                              Perdita di Peso
                              Idealmente per perdere peso andrebbe consumato il 20% in meno del TDEE calcolato in precedenza.

                              Tenere le calorie in positivo è essenziale per guadagnare peso
                              Una buona regola per calcolare il numero di kcal che ci servono per guadagnare massa è quello di aggiungere 300-500 kcal alla dieta o di aggiungere al TDEE il suo 15-20%

                              References:
                              1. Katch, Frank, Katch, Victor, McArdle, William. Exercise Physiology: Energy, Nutrition, and Human Performance, 4th edition. Williams & Wilkins, 1996.
                              2. Whitney, Eleanor, Rolfes, Sharon. Understanding Nutrition, 8th Edition, Wadsworth Publishing, 1999.
                              3. American College of Sports Medicine. Position Statement on proper and improper weight loss programs. Medicine and Science in Sports and Exercise 15: ix - xiii, 1983.
                              4. McDonald, Lyle. The Ketogenic Diet.
                              Morris Publishing. 1998

                              Insistere è testardaggine. Perseverare è determinazione
                              Manchester TRAIN HARD SINCE 1997

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                              • Manchester
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                                #60
                                Posto pure l'originale non riassunto e tradotto

                                Calorie Calculators
                                Author: Tom Venuto



                                Date: Mar 01, 2000



                                Publisher: Fitness Renaissance




                                The first step in designing a personal nutrition plan for yourself is to calculate how many calories you burn in a day; your total daily energy expenditure (TDEE). TDEE is the total number of calories that your body expends in 24 hours, including all activities. TDEE is also known as your "maintenance level". Knowing your maintenance level will give you a starting reference point from which to begin your diet. According to exercise physiologists William McArdle and Frank Katch, the average maintenance level for women in the United States is 2000-2100 calories per day and the average for men is 2700-2900 per day. These are only averages; caloric expenditure can vary widely and is much higher for athletes or extremely active individuals. Some triathletes and ultra-endurance athletes may require as many as 6000 calories per day or more just to maintain their weight! Calorie requirements may also vary among otherwise identical individuals due to differences in inherited metabolic rates.
                                Methods of determining caloric needs
                                There are many different formulas you can use to determine your caloric maintenance level by taking into account the factors of age, sex, height, weight, lean body mass, and activity level. Any formula that takes into account your lean body mass (LBM) will give you the most accurate determination of your energy expenditure, but even without LBM you can still get a reasonably close estimate.
                                The "quick" method (based on total bodyweight)
                                A fast and easy method to determine calorie needs is to use total current body weight times a multiplier.
                                Fat loss = 12 - 13 calories per lb. of bodyweight
                                Maintenance (TDEE) = 15 - 16 calories per lb. of bodyweight
                                Weight gain: = 18 - 19 calories per lb. of bodyweight

                                This is a very easy way to estimate caloric needs, but there are obvious drawbacks to this method because it doesn't take into account activity levels or body composition. Extremely active individuals may require far more calories than this formula indicates. In addition, the more lean body mass one has, the higher the TDEE will be. Because body fatness is not accounted for, this formula may greatly overestimate the caloric needs if someone is extremely overfat. For example, a lightly active 50 year old woman who weighs 235 lbs. and has 34% body fat will not lose weight on 3000 calories per day (255 X 13 as per the "quick" formula for fat loss).
                                Equations based on BMR.
                                A much more accurate method for calculating TDEE is to determine basal metabolic rate (BMR) using multiple factors, including height, weight, age and sex, then multiply the BMR by an activity factor to determine TDEE. BMR is the total number of calories your body requires for normal bodily functions (excluding activity factors). This includes keeping your heart beating, inhaling and exhaling air, digesting food, making new blood cells, maintaining your body temperature and every other metabolic process in your body. In other words, your BMR is all the energy used for the basic processes of life itself. BMR usually accounts for about two-thirds of total daily energy expenditure. BMR may vary dramatically from person to person depending on genetic factors. If you know someone who claims they can eat anything they want and never gain an ounce of fat, they have inherited a naturally high BMR. BMR is at it's lowest when you are sleeping undisturbed and you are not digesting anything. It is very important to note that the higher your lean body mass is, the higher your BMR will be. This is very significant if you want to lose body fat because it means that the more muscle you have, the more calories you will burn. Muscle is metabolically active tissue, and it requires a great deal of energy just to sustain it. It is obvious then that one way to increase your BMR is to engage in weight training in order to increase and/or maintain lean body mass. In this manner it could be said that weight training helps you lose body fat, albeit indirectly.
                                The Harris-Benedict formula (BMR based on total body weight)
                                The Harris Benedict equation is a calorie formula using the factors of height, weight, age, and sex to determine basal metabolic rate (BMR). This makes it more accurate than determining calorie needs based on total bodyweight alone. The only variable it does not take into consideration is lean body mass. Therefore, this equation will be very accurate in all but the extremely muscular (will underestimate caloric needs) and the extremely overfat (will overestimate caloric needs).
                                Men: BMR = 66 + (13.7 X wt in kg) + (5 X ht in cm) - (6.8 X age in years)
                                Women: BMR = 655 + (9.6 X wt in kg) + (1.8 X ht in cm) - (4.7 X age in years)
                                Note: 1 inch = 2.54 cm.
                                1 kilogram = 2.2 lbs.

                                Example:
                                You are female
                                You are 30 yrs old
                                You are 5' 6 " tall (167.6 cm)
                                You weigh 120 lbs. (54.5 kilos)
                                Your BMR = 655 + 523 + 302 - 141 = 1339 calories/day

                                Now that you know your BMR, you can calculate TDEE by multiplying your BMR by your activity multiplier from the chart below:
                                Activity Multiplier
                                Sedentary = BMR X 1.2 (little or no exercise, desk job)
                                Lightly active = BMR X 1.375 (light exercise/sports 1-3 days/wk)
                                Mod. active = BMR X 1.55 (moderate exercise/sports 3-5 days/wk)
                                Very active = BMR X 1.725 (hard exercise/sports 6-7 days/wk)
                                Extr. active = BMR X 1.9 (hard daily exercise/sports & physical job or 2X day training, i.e marathon, contest etc.)

                                Example:
                                Your BMR is 1339 calories per day
                                Your activity level is moderately active (work out 3-4 times per week)
                                Your activity factor is 1.55
                                Your TDEE = 1.55 X 1339 = 2075 calories/day

                                Katch-McArdle formula (BMR based on lean body weight)
                                If you have had your body composition tested and you know your lean body mass, then you can get the most accurate BMR estimate of all. This formula from Katch & McArdle takes into account lean mass and therefore is more accurate than a formula based on total body weight. The Harris Benedict equation has separate formulas for men and women because men generally have a higher LBM and this is factored into the men's formula. Since the Katch-McArdle formula accounts for LBM, this single formula applies equally to both men and women.
                                BMR (men and women) = 370 + (21.6 X lean mass in kg)
                                Example:
                                You are female
                                You weigh 120 lbs. (54.5 kilos)
                                Your body fat percentage is 20% (24 lbs. fat, 96 lbs. lean)
                                Your lean mass is 96 lbs. (43.6 kilos)
                                Your BMR = 370 + (21.6 X 43.6) = 1312 calories

                                To determine TDEE from BMR, you simply multiply BMR by the activity multiplier:
                                Example:
                                Your BMR is 1312
                                Your activity level is moderately active (work out 3-4 times per week)
                                Your activity factor is 1.55
                                Your TDEE = 1.55 X 1312 = 2033 calories

                                As you can see, the difference in the TDEE as determined by both formulas is statistically insignificant (2075 calories vs. 2033 calories) because the person we used as an example is average in body size and body composition. The primary benefit of factoring lean body mass into the equation is increased accuracy when your body composition leans to either end of the spectrum (very muscular or very obese).
                                Adjust your caloric intake according to your goal
                                Once you know your TDEE (maintenance level), the next step is to adjust your calories according to your primary goal. The mathematics of calorie balance are simple: To keep your weight at its current level, you should remain at your daily caloric maintenance level. To lose weight, you need to create a calorie deficit by reducing your calories slightly below your maintenance level (or keeping your calories the same and increasing your activity above your current level). To gain weight you need to increase your calories above your maintenance level. The only difference between weight gain programs and weight loss programs is the total number of calories required.
                                Negative calorie balance is essential to lose body fat.
                                Calories not only count, they are the bottom line when it comes to fat loss. If you are eating more calories than you expend, you simply will not lose fat, no matter what type of foods or food combinations you eat. Some foods do get stored as fat more easily than others, but always bear in mind that too much of anything, even "healthy food," will get stored as fat. You cannot override the laws of thermodynamics and energy balance. You must be in a calorie deficit to burn fat. This will force your body to use stored body fat to make up for the energy deficit. There are 3500 calories in a pound of stored body fat. If you create a 3500-calorie deficit in a week through diet, exercise or a combination of both, you will lose one pound. If you create a 7000 calories deficit in a week you will lose two pounds. The calorie deficit can be created through diet, exercise or preferably, with a combination of both. Because we already factored in the exercise deficit by using an activity multiplier, the deficit we are concerned with here is the dietary deficit.
                                Calorie deficit thresholds: How low is too low?
                                It is well known that cutting calories too much slows down the metabolic rate, decreases thyroid output and causes loss of lean mass, so the question is how much of a deficit do you need? There definitely seems to be a specific cutoff or threshold where further reductions in calories will have detrimental effects. The most common guideline for calorie deficits for fat loss is to reduce your calories by at least 500, but not more than 1000 below your maintenance level. For some, especially lighter people, 1000 calories may be too much of a deficit. The American College of Sports Medicine (ACSM) recommends that calorie levels never drop below 1200 calories per day for women or 1800 per day for men. Even these calorie levels are extremely low. A more individualized way to determine the safe calorie deficit would be to account for one's bodyweight or TDEE. Reducing calories by 15-20% below TDEE is a good place to start. A larger deficit may be necessary in some cases, but the best approach would be to keep the calorie deficit through diet small while increasing activity level.
                                Example 1:
                                Your weight is 120 lbs.
                                Your TDEE is 2033 calories
                                Your calorie deficit to lose weight is 500 calories
                                Your optimal caloric intake for weight loss is 2033 - 500 = 1533 calories

                                Example 2: Your calorie deficit to lose weight is 20% of TDEE (.20% X 2033 = 406 calories)
                                Your optimal caloric intake for weight loss = 1627 calories

                                Positive calorie balance is essential to gain lean bodyweight
                                If you want to gain lean bodyweight and become more muscular, you must consume more calories than you burn up in a day. Provided that you are participating in a weight-training program of a sufficient intensity, frequency and volume, the caloric surplus will be used to create new muscle tissue. Once you've determined your TDEE, the next step is to increase your calories high enough above your TDEE that you can gain weight. It is a basic law of energy balance that you must be on a positive calorie balance diet to gain muscular bodyweight. A general guideline for a starting point for gaining weight is to add approximately 300-500 calories per day onto your TDEE. An alternate method is to add an additional 15 - 20% onto your TDEE.
                                Example:
                                Your weight is 120 lbs.
                                Your TDEE is 2033 calories
                                Your additional calorie requirement for weight gain is + 15 - 20% = 305 - 406 calories
                                Your optimal caloric intake for weight gain is 2033 + 305 - 406 = 2338 - 2439 calories

                                Adjust your caloric intake gradually
                                It is not advisable to make any drastic changes to your diet all at once. After calculating your own total daily energy expenditure and adjusting it according to your goal, if the amount is substantially higher or lower than your current intake, then you may need to adjust your calories gradually. For example, if your determine that your optimal caloric intake is 1900 calories per day, but you have only been eating 900 calories per day, your metabolism may be sluggish. An immediate jump to 1900 calories per day might actually cause a fat gain because your body has adapted to a lower caloric intake and the sudden jump up would create a surplus. The best approach would be to gradually increase your calories from 900 to 1900 over a period of a few weeks to allow your metabolism to speed up and acclimatize.
                                Measure your results and adjust calories accordingly
                                These calculations for finding your correct caloric intake are quite simplistic and are just estimates to give you a starting point. You will have to monitor your progress closely to make sure that this is the proper level for you. You will know if you’re at the correct level of calories by keeping track of your caloric intake, your bodyweight, and your body fat percentage. You need to observe your bodyweight and body fat percentage to see how you respond. If you don't see the results you expect, then you can adjust your caloric intake and exercise levels accordingly. The bottom line is that it’s not effective to reduce calories to very low levels in order to lose fat. In fact, the more calories you consume the better, as long as a deficit is created through diet and exercise. The best approach is to reduce calories only slightly and raise your daily calorie expenditure by increasing your frequency, duration and or intensity of exercise.
                                References:
                                1. Katch, Frank, Katch, Victor, McArdle, William. Exercise Physiology: Energy, Nutrition, and Human Performance, 4th edition. Williams & Wilkins, 1996.
                                2. Whitney, Eleanor, Rolfes, Sharon. Understanding Nutrition, 8th Edition, Wadsworth Publishing, 1999.
                                3. American College of Sports Medicine. Position Statement on proper and improper weight loss programs. Medicine and Science in Sports and Exercise 15: ix - xiii, 1983.
                                4. McDonald, Lyle. The Ketogenic Diet.
                                Morris Publishing. 1998

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