Meal planning is number 1.

Being strict with what you buy then so you don’t buy something you have no plan for.

Learn a couple of meals that you can throw anything into so you can use up veg that are just about to go off. Eg ratatouille, stew, curry, etc.

Buy a recipe book with easy one pot meals for inspiration. I find the Internet just has too much and you need to know what you’re doing, plus there’s just too much distraction. Sitting with a recipe book and a pen and paper to plan is way more relaxing, IME.

Bulk make your food. I find that making cooking an “event” you do every week or so is much more manageable than trying to cook your own food each night.

I’m a big fan of soups, stews and chili. I have a large stock pot and I’ll basically make one of those to where it’s almost full. It can take a long time to cook that much food, but it makes tons of servings. Then I’ll freeze 1/2 to 2/3 of it for future meals. I actually find these types of dishes are even better once you thaw them out. Nutrition wise it’s basically a ton of veggies/beans and some meat, so fairly cheap per meal made and super nutritious.

Bodybuilder style “meal prep” is also awesome if you don’t mind having the same meals multiple times a week. I like bulk making brown rice in a rice cooker along with some kind meat or fish and finally then adding in a microwave steam pack of veggies. If you have an Aldi available to you their California blend is awesome and fairly affordable for the convenience of just popping it in the microwave. Shout out to Sam’s Club and Costco who both have bulk packs of frozen meat and veggies to help on cost.

It can get more complicated if you live with others who have different tastes and preferences from yourself. Another hurdle is having the ability to freeze all the excess foods. But when I was single living in my own apartment I don’t think I ever ate more simply and affordably than that. Sprinkle in the occasional “treat” of some kind of takeout and you’re living the good life!

E: This is obviously from a US perspective, but I’m sure my non-us counterparts can substitute in their equivalents where needed.

1. Get a big freezer. It’s really surprising how much delicious stuff you can make just from frozen stuff that can last you forever. Frozen food is also often more fresh and with microwave and air fryer the prep of anything frozen is actually not very difficult.
2. Outsource as much as possible. Often it’s really hard to outcompete efficient kitchens. I don’t mean order Uber eats or something but there’s likely a place in your vicinity that does food prep where you can take your food containers and stock up for 2-3 days. You can even freeze some dishes.

Wife and I really did the math because we feared of becoming lazy and it makes absolutely zero economic sense to cook everything at home right now unless you want to treat yourself or live in a very economically unusual places where #2 is not accessible.

It comes down to planning meals and a certain amount of acceptance that what you’ve got in the house is what you eat, period, even if the specific food isn’t what you’re in the mood for at the moment. Fast food, doordash etc are difficult habits to break. They reward your desire to have what you want when you want it, which is a big reward, and can make living on your own food feel like a punishment by comparison. But that feeling is just part of the habit. Eventually it goes away.

This is actually a real issue for a lot of people. The solution that I found is that you should sit down and write out a meal plan for the upcoming week. Like actually sit down and plan out your every meal and include snacks as well. Then write down the things you need to buy for those meals and snacks. Make sure you only put down things that you actually like eating.

When you go shopping take that list with you, and only buy the things you wrote on there and only buy amounts for the meals you’re planning for. If by the end of the week, you bought too much, then that means there are meals in your planner that you don’t really like. From there, you can refine your list and make improvements every week.

Only buy stuff you’re excited to eat

This is probably intended to be tongue-in-cheek, but meal planning is the answer. Block off some time (Sunday evenings are popular), to figure out all your meals for the week, make a list of everything you need to make all the dishes on the menu, go to the store and buy all that stuff and nothing else, make ahead and freeze any meals that you can and do any prep work ahead of time that you can.

Viola: intentional eating, less waste, and always something on hand to eat.

It changed my life in a lot of positive ways.

A slow cooker helps. You can use random ingredients before they go bad easily enough, and you will have left overs so cooking one time results in not having to cook for multiple meals.

I just hunt and eat the homeless. I work for the municipality so I just leave what I don’t eat around park benches, bus stops and the front of stores to scare the rest away.

1. Consider therapy or medication.

2. Buy nonperishables in a higher ratio, such as canned, pickled, or dry goods.

3. If you’re not concerned about your health enough to cook your own food every day, then just don’t buy food that has to be cooked every day.

4. Remind yourself why you’re doing it, set a timer, and get it done. “This is for me. I love good food, I love my body.”

This happens to us - if I cook dinner for everyone, two of us eat, if I cook dinner for two of us, everyone wants to eat. If I make enough for leftovers, nobody takes them to lunch. If I don’t make enough, they ask why there is not enough for lunch.

Things that help on your question though -

Canned beans, canned tomatoes, canned coconut milk, canned pumpkin, jarred spaghetti sauce, spices - a lot of our staples are not perishable.

Do you live where you can stop by the store on the way home? Then don’t buy perishables for the week, buy them for the meal you are making.

Some foods and meals freeze pretty well, freeze them and keep a list of what’s in the freezer so you remember to eat it.

I hate meal planning but it helps a lot. I sometimes put a note on the fridge “we have food for dal with spinach, chicken & cabbage, sheet pan gnocchi with sausage and broccoli, eggs and potatoes” or whatever we have the food to make, and cross them off as they are made.

Some foods make other foods. So if I make a hunk of pork, it’s pork, rice and beans then enchiladas then burritos, and so on.

Buy food that has a long shelf life - lentil, rice, beans, canned vegetables, salsa jars. As a bonus it also doesn’t have to be refridgerated.

Buy stuff you don’t have to cook. It’s crap nutritionally, but at least it isn’t wasted!

Use a software/app to meal plane. (Mealie/Tandoor) You pick the recipes you fancy for the days/week/whatever period. It generates a grocery list containing exactly what is needed for the meals you chose, nothing else.

I haven’t thrown away anything in a couple years now. Oh and freeze leftovers if needed.

I buy stuff that lasts. For bread, I find that rye takes weeks longer than white or wheat to start going bad, and bagels last ages too. I make smoothies with mostly frozen fruit. For dinner stuff, if I’m not feeling like cooking I either buy things I’m going to eat in the next few days or I get these sealed precooked things from Aldi that are great and keep well. Coconut milk also tends to keep better than cow milk and lately I’ve realized I greatly prefer it.

About the only things that are super perishable that I keep around are bananas and avocados, and I just tend to eat these a lot. I also keep spinach or kale around for my smoothies, but I rebag them into separate smaller bags as soon as I get them. If my bananas are getting overripe, they get frozen for smoothies.

I also tend to buy canned soups, which last ages.

When I was cooking regularly I’d make a lot of chilis and pasta sauces. They’re good to freeze and they keep well on their own. Chili is arguably better after freezing and having more time to develop.

You can definitely eat pretty healthy and keep plenty of food in the house without constantly chasing waste.