This is a pretty interesting string. I like @Voxel’s point about articles are for the middle of the bell curve - I think that’s probably at the heart of this.
I also think definitions matter here: “performance” is incredibly relative to your sport/ activity.
I am really starting to come to mind that there are absolute values in the nutrition game more than just the relative numbers we tend to use. The relative numbers matter, obviously, because a 120lbs. woman simply is not going to get the same results from the same calorie/ macro breakdown as a 275lbs. powerlifting man. I think, however, maybe some of the reasons we see such variances in studies that look at the anabolic effects of protein grams per unit of bodyweight is because these differences don’t scale linearly with bodyweight.
We already know, for example, that our maintenance calorie intake has a (sometimes pretty wide) range. Further, we take for granted there are base thresholds for acute leucine intakes to maximize muscle protein synthesis, that ~30g carbs will disrupt ketosis, that <40g of fat may impact hormone production, that the brain (keeping it simple on purpose, don’t school me on gluconeogenis, please, although I could stand to learn) uses a bit over 100g of carbs per day, etc.
I propose that our actual needs arise from a baseline minimum (calories and macros), plus a relative number that may or may not scale linearly with bodyweight, to some soft maximum threshold.
We’d set that up with minimums - easy enough to say 130g carbs for our brain, 40g fat for our hormones, and 130g protein (~30g yields 3g leucine, in 4 MPS opportunities per day). You’d then scale each of those up based on preference, training (more glycogen-depleting = more carbs or heavy weight/ low rep = more fat; poor weight training recovery = more protein) and adjust based on caloric need. I don’t think there is anything wrong with bodyweight x 15 as a starting point, but (to the point of outliers as well), I have really done better myself by just tracking what I eat for a week with no changes (because you always have a base case - you’re already eating!), and adjusting from there.
Anyway, sorry for the novel, and I really know nothing nor have I trained anyone, so this is worth as much as the virtual ink I used to type it. Just thoughts rolling around.
In any case, @JamesBrawn007, I’ve always liked your posts on nutrition and I hate long diets, so I am very curious: how would you approach a diet for a powerlifter that needs to drop something realistic, let’s say 20lbs.?