Curious what new work had been done on this (Vegans Have Lower Fasting Glucose, Better Insulin Sensitivity … Compared To Matched Omnivores, I found:
Vegetarians Have A Lower Fasting Insulin Level And Higher Insulin Sensitivity Than Matched Omnivores: A Cross-Sectional Study, Nutrition, Metabolism, and Cardiovascular Diseases, February 2019
This study had three groups, vegetarian (ate eggs and cheese), vegan (no eggs, cheese, or other animal food), and omnivores (ate animal food). It found that insulin resistance was lower (good) in vegetarians and vegans compared to omnivores. However, the association for vegetarians was no longer significant when they adjusted for confounders (BMI, visceral fat area, physical activity, sedentary time, income, alcohol consumption, and daily dietary intakes of macronutrients).
Vegetarian doesn’t do it. You have to drop the eggs and cheese.
Anecdotally, I saw some of the highest cholesterol levels in people who called themselves vegetarian. It seems vegetarians end up eating more eggs, cheese, and other dairy foods almost as a replacement for meat. Maybe because they think they need protein? Unfortunately, dairy food is one of the highest sources of saturated fat in the human diet.