The dark side of protein is that food labels overstate how much of it a human can actually absorb and use, so a diet can meet its protein target on paper and fall short in practice. Vegetarians and vegans also show a higher risk of stroke than meat eaters, despite a lower risk of coronary heart disease.
Protein is the macronutrient most often assumed to be adequate simply because a label says so. Both halves of that assumption deserve examination: what the label counts, and what a diet excluding animal products delivers over decades.
Why the label overstates protein
It is unwise to use the food labels of processed foods to determine actual protein content, because labeling is based on a food component calculation rather than on the protein a human can actually absorb and use. Nitrogen-based estimation counts nitrogen from sources that are not usable protein, and processing changes bioavailability further.
The practical consequence is that a diet meeting its protein target on paper can fall short in practice, and the gap widens with age as efficiency of utilization declines.
Stroke risk in vegetarians and vegans
Vegetarians and vegans may be at higher risk of stroke than meat-eating counterparts, while showing a lower risk of coronary heart disease. Both findings coexist in the same data and both deserve to be reported. The stroke signal is the one most often omitted when these diets are recommended.
Sarcopenia and the long view
A long-term vegan diet carries a genuine risk of sarcopenia where protein intake and quality are inadequate, and metainflammation can persist regardless of whether animal products are present. Patients frequently presume the Standard American Diet is entirely to blame for their metabolic syndrome and that removing meat resolves it. The variable that matters is the metabolic environment, not the category of food excluded.
What this is not
None of this is an argument against a plant-based diet, which many people run successfully for decades. It is an argument for measuring rather than assuming — protein adequacy, B12, iron, and the inflammatory markers that reveal whether the diet is doing what it was adopted to do.
