It may not be an option if you’re severely restricted on space but it helps if you make enough to freeze a couple extra portions of food and eat them weeks later. Generally when you are cooking for yourself it’s healthier than processed or restaurant food and it’s cheaper. I tend to gravitate to international markets where they have bulk bins of vegetables so you are able to just buy a single carrot, single potato etc. Cooking in slightly larger portions and shopping that way really helps to reduce waste for myself.