Middle age and working. Believed the conventional wisdom of the then 'food pyramid' biased on carbohydrates, sweets and soft drinks are OK. People always bringing in fattening foods like pizza and going out for fast-food lunches daily. It sneaks up on you, then you discover your clothes don't fit and It's best to never get fat in the first place then have to diet

Saved by Dr Atkins book I got in the used book store for $1 -- they had lots of copies back then, it was considered a fad diet LOL