That warning is a disclaimer for liability purposes. Whey protein is not a meal replacement as it does not contain the micronutrients needed in a good diet. It is to be used as a supplement only.
As for your protein needs, this is an individual choice. Body builders try to get as much as 50% calories from protein. General dietary guidelines say 15-25%. I lift fairly intensely (for me anyways) and try to get 25-30% protein. I also drink a whey protein drink during the week to supplement the protein. I don't want to spend all my time in the kitchen cooking up meals.
100 grams protein on a 1200-1400 calorie diet is good, a fair amount of protein. I get anywhere from 90-125 grams a day on a 1500 calorie diet. The low days are the days on which I cook a non-meat meal for dinner. While tofu and beans are a good source of protein, they aren't as good as meat, chicken or fish.
Hope this helps...
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