>> Many basic questions about diet are unsolved, including the reason(s) that some people gain weight while others don't and the reasons that the vast majority of people can't lose weight. We just do not know to what extent do genetics, gut flora, lifestyle, and diet affect weight. We also don't know what makes for a "good" diet, or whether the same diet is good for everyone. > > Also flat out not true. You're creating some ridiculous standard for "knowledge" when in reality, you only have to have "good enough" knowledge in order to be healthy and not obese. Most people can easily adhere to, but for whatever reason, don't.

OK, this is a concrete claim that we can test: "most people can easily adhere to a 'good enough' diet/lifestyle to avoid being obese".

If this were true, then there would exist a protocol that "easily" results in lasting weight loss for most people, right?

Does such a protocol exist?