Sarah Hallberg's early career involved advising low-calorie, low-fat diets, reflecting the dogma of the 1980s.

“for a very long time i mean i've been in the world of obesity care for well over 25 years now and just the first half of that was telling people that the way to fix everything was to eat a low calorie low fat diet you know i grew up as a product of the 80s like so many people where that was you know that was the dogma there was no other way and of course entering into college and um grad school where i got both my bachelor's and master's in exercise physiology i mean that's what we were taught”