How can a busy freelance designer start healthy meal planning for one?

[Abigail4]

I'm a freelance graphic designer working from home, and my erratic schedule has led to terrible eating habits, mostly consisting of takeout and snacks. I want to get serious about healthy meal planning to improve my energy and focus, but I struggle with the upfront time investment and often get overwhelmed by complex recipes. For others who have successfully built this habit, what's a realistic starting point for someone cooking for one? How do you efficiently plan a week of varied, nutritious meals without wasting food, and what are your go-to batch-cooked staples that reheat well? Do you use any particular apps or templates to streamline the process, and how do you handle the temptation to just order in when you're tired after a long workday?