Constitutional psychology is not a theory but an assumption, failing to acknowledge body type changes with age:
Illegal use of nude Ivy league photos:
Visual assessment and no measurements:
His work was driven by his own stereotypical/discriminatory views:
DISCLAIMER: due to the lack of long-term studies on keto/low/no carb diets my current statement is that ketosis is not sustainable. That statement is not definitive and as we get more research it might change depending on the results of those studies.