The protein problem
This is the big kahuna of health problems. Sure, vegan diets are also notorious for their micronutrient issues like imbalanced omega-6 to omega-3 ratios. However, not getting enough of the macronutrient protein is THE big problem. More specifically, getting enough bioavailable amino acids of the right kind (the building blocks of protein) is difficult if not impossible by food alone.
Is my plant protein bioavailable?
When we ask if this or that protein is bioavailable, we’re looking at how much of that plant protein can be usefully converted to protein in our body that can carry out its intended functions. There are multiple ways to measure this, such as Net protein Utilization, Protein Efficiency Ratio, Nitrogen Balance, Protein digestibility and Protein Digestibility Corrected Amino Acid Score . For now though, what is key to grasp is the overarching theme, that protein in plant form is generally poorly bioavailable when compared to protein from animals.