Citation?
I think the best diet science has identified in treating obesity is cutting out processed foods. Whether it's processed plant or animal food.
Heart disease and diabetes comes from sugar and carbs, all of which are plant based.
The reversal of heart disease with this diet has been proven decades ago - https://nutritionfacts.org/2011/10/14/heart-disease-there-is...
No one knows the exact cause of diabetes, there could several causes. Processed foods are not whole foods. White flour, marguerine, processed sugar, cheetoes, that's a not a whole food it's not comparable to potatoes and bananas.
Here is the opinion of one of the leading experts in Diabetes, Neal Barnard - https://www.youtube.com/watch?v=S51D07bvlPY
He mentions that diabetes seems to be linked to an excessive consumption of fat, that inhibits the absortion of sugar.
He has studies published showing that a whole-food plant based diets in some cases has made the person stop taking insuline altogether.
https://www.diabetes.co.uk/in-depth/whats-at-the-heart-of-he...
We know the cause of diabetes, it's elevated insulin over time. We know what elevates insulin, it's carbohydrates. We know fat doesn't raise insulin.
That website, nutritionfacts.org is quite wrong in several places. I read some of the articles, it's not that good I'd avoid it.