When they say 1g per pound for protein or .5g per pound for fat is that based on lean body weight or actual body weight. For a dieting ?
1 gram of protein per Lb of bodyweight is good for bulking AND cutting. This is because it helps preserve lean mass in a cut, and helps to build lean mass in a bulk. If someone is large enough that it’s not feasible to consume 1 gram of protein per lb of bodyweight, then the recommendation changes to 1 gram per Lb of lean mass OR 1 gram per Lb of target weight.
As for fat intake, the only thing I’ve heard was that you need about 0.3g per lb of lean mass to maintain health.
>.5g per pound for fat
Unless you are bulking that is relatively high. Let’s say the average male is 180lbs that would imply that in his caloric intake, he would be intaking 90g of fat or 810* calories, just from fat alone.
EDIT: Guide for fat consumption based on caloric intakie
https://my.clevelandclinic.org/health/articles/4182-fat-and-calories
This is a tricky question. As a general rule, all guidelines for fat and protein intake are based on kg/lb body weight https://www.jandonline.org/article/S2212-2672(15)01802-X/fulltext. In 2017, th Exos guidelines are based on FFM. Latest version of EXO NUTRITION STARTER GUIDE also uses body weight. But, in my opinion, sometimes it is not right. When I was a student, I was taught to use ideal/desired body weight to calculate nutrient requirements for patients on enteral/parenteral nutrition. Because, using the current weight, if patients are overweight, we will give too many macronutrients, and if patients with malnutrition, on the contrary, not enough.
Please look on this research https://www.sciencedirect.com/science/article/pii/S2405457722000250 They do comparison of three different approach to calculate protein intake needs.
I prefer to use all two approaches. If it’s an athlete with a lot of muscle mass and too much fat who wants to lose weight, I do my calculations based on FFM because FFM is metabolically active tissues. In case of malnutrition, I use ideal/desired weight. In the case of a normal weight with an optimal body percentage, I use the current weight/FFM and also take into account on the source of protein.