Any advice pls

I’m really scared tbh lately because I’ve seen alot of my family members get ill because of what they eat and not looking after themselves like basic hygiene which I have been struggling myself and I keep noticing that eating unhealthy food really has a bad effect on my body and I don’t wanna go through any more pain so I’m gonna try my best at eating healthy and completely cut out greasy food and to also drink more water but does anyone have any advice on what foods I should eat and drinks and basic hygiene I should know of also does anyone know what to wash feet with because it’s abit yellow like discolouring to the skin I usually use body wash tbh