People on a low-fat, plant-based diet ate fewer daily calories but had higher insulin and blood glucose levels, compared to when they ate a low-carbohydrate, animal-based diet, according to a small but highly controlled study at the National Institutes of Health.
https://www.eurekalert.org/pub_releases/2021-01/niod-nsc011921.php
https://www.eurekalert.org/pub_releases/2021-01/niod-nsc011921.php