Hello, I always have eczema in my hands and foot even it is stop or healing it is also back. What I should do what food I can't eat?

Food a mnor factor. I suspect you have dishydrotic eczema. If you want to try a low-zinc diet, that is up to you. You'd probably do as well to manage it with local hygiene and judicious use of a glucocorticoid or other topical, and perhaps try to figure out whether you're allergic to anything with which you're coming into contact.