I've been drinking "bulletproof coffee" lately as part of a diet. Basically coffee with butter, coconut oil, and flavia. Supposedly gives me good fats and no sugar to serve as a mini-meal and help me keep a fast. The one thing about it is that it's tedious to prepare in the morning. Maybe that's a hint that there could a business selling "health" coffee drinks, coffee with supplements, etc. That's one thing I really haven't seen offered commercially.