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> Protein dominates the grocery shelves: Protein chips. Protein cookies. Protein water.

Yeah and most of it is incomplete plant protein missing amino acids.

> Protein restriction, Phillips says, is a sort of “lite” version of a more well-known longevity hack — caloric restriction.

I'm confused by this since protein is much lower calorie than fat or carbs.

>Yeah and most of it is incomplete plant protein missing amino acids.

Common misconception. Soybean, quinoa, buckwheat provide all essential amino acids in good proportions

almost all plant proteins contain all nine essential amino acids, just in lower proportions.

protein and carbohydrate are both 4 calories per gram?

When you include the thermic effect of food protein is closer to 3 calories per gram. Ie it burns about a calorie to digest a gram of protein

Protein serving size is generally lower than carbs in a typical meal. It's not that simple.