Specifically for diet, I feel exactly like this every time I try to get nutrition advice, online or elsewhere. It seems like everyone disagrees, but in the end I don't have a concrete answer to "how do I not die" and have to choose something as eating is an obligation. Eventually I decided to stick to simple foods like lentils on a daily basis and to stay away from processed things. I feel hungrier on average, but I guess it's a tradeoff for not dying too early. I tend to remember Michael Pollan's mantra: Eat food, not too much, mostly plants.