a better diet: https://yt.artemislena.eu/watch?v=61GitUC_678 (trailer)
full movie at https://archive.org/details/The_Magic_Pill

traditional food, before the advent of medically and scientifically recommended grains, food with fat

I'm liking the movie, but I also needed a break. It gets a bit sad. The disclaimer said the results (in the trailer) are "anecdotal" and that exercise, sunlight, and a few other factors play a part like the food choices.

Warning—they included the TERF, Lierre Keith.