Thing is most people don't actually care, and individual measurements are usually just vanity metrics. We already know that fructose is poisonous. We already

Thing is most people don't actually care, and individual measurements are usually just vanity metrics. We already know that fructose is poisonous. We already know that processed foods are engineered to keep you hungry. But people eat this stuff anyway. I no longer use fitness devices, and the people I know who use them are almost always in suboptimal health and make no progress, no matter how many "steps" or "calories" their devices claim they are producing. Stop eating poison and one's health usually improves – no tech needed. Better yet if you give your body adequate time to dig in to its own fat stores. People want easy solutions and to feel smart. Smart watches and Oura rings claim exactly that. Don't research, don't think – just hit a reductive number so your watch can tell you you're "on track" and give you permission to eat some Cheetoes and coke.