Right and also specifics of peoples anatomy. For example people with acid reflux due to certain reasons like a hiatal hernia are advised to eat frequent, smalle

Right and also specifics of peoples anatomy. For example people with acid reflux due to certain reasons like a hiatal hernia are advised to eat frequent, smaller meals. So the idea of cramming all eating into 8 hours/day or to skip breakfast would be counterproductive. The only thing that works for everyone is - move more, eat less, eat more nutritionally, sleep enough. Unfortunately the ability to do this is often tied to income / job status. Most of the rest of these magic tricks only works on the margins, or to specific individuals.