Lack of time is 1 reason we like junk food. Nobody has time to cook 3x/day. Cook your food in bulk. Even if you work from home. This way you only need to warm-up your meals when it’s time to eat.
Morning. Wake up 30 mins earlier so you can prepare all your meals while making breakfast.
Evening. If you have trouble waking up early, cook your meals for the next day when coming back from work or while preparing dinner.