A number of us take this approach --
Understand your protein needs (depends on age, gender, activity level)
Understand your carb tolerance (varies, depends on how damaged you are by prior life)
Remainder is fat - which can be dietary or from on-board storage
Both protein and carb are 4 kcal/gram, and fats are 9 kcal/gram.
So - as an example:
Female, post menopausal, 5'1" or 155cm, moderate activity, goal weight 120 pounds/55kg:
Protein needed = 55g +10%, or 60g -->240 kcal
Carb max = 30g (known from experience as well as 50% protein grams) --> 120 kcal
Fat = rest of caloric needs, ~120g --> 1080 kcal
Total kcal = 1440 kcal
A young and active male needs more protein, and may well tolerate more carbs. A lot of this is figuring out what works for you. It varies a lot from one person to another - you generally have to experiment (called n=1).



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