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This is a nutrition challenge with one rule: every meal you eat for 30 days is one you made at home. No takeaways, no restaurants, no ready meals, no meal deals, no canteen. It does not tell you what to cook or how much. Soup, bread, pasta, curry, muffins, a fried egg on toast - anything counts as long as it was made from ingredients in your own kitchen. You need a kitchen, some basic equipment and more time than you are probably spending on food right now. There is no fitness level involved.

The calendar is 30 identical days because the rule never changes. What changes is the amount of effort it takes. The first week is the expensive one in time and attention since every meal is a decision and you have no fallback. By the second week you have a rotation of things you can make without thinking and a fridge that supports it. The difficulty rating is 4 because this is a planning challenge dressed up as a food challenge. Ninety meals in a row with no shortcut is a lot of shopping, cooking and washing up, and lunches at work, travel and other people's kitchens are where most people lose the streak.

How to do the challenge

Homemade means you cooked or assembled it from ingredients. Ingredients are things like vegetables, fruit, meat, fish, eggs, dried and tinned beans, rice, pasta, flour, oats, bread, cheese, milk, plain yoghurt, nuts, oil, herbs and spices. Frozen vegetables and frozen fruit count. A jar of passata counts. What does not count is anything sold ready to eat or ready to heat: ready meals, frozen pizza, instant noodles, sandwiches from a shop, sauces in a jar that are the whole meal, breakfast bars and any food that arrived at your door already cooked. If it needs more than heating up and you did that work yourself, it is homemade.

Snacks follow the same rule. Fruit, nuts, a boiled egg, toast, leftovers and things you baked are all fine. Crisps, biscuits and chocolate bars are not, not because they are junk but because you did not make them. If you want an oat bar, you bake the oat bar.

Plan your lunches on day 1 because that is where this challenge is won or lost. Cook extra at dinner and take the leftovers. Batch cook two or three things on a quiet day and freeze them in portions. DAREBEETS has recipes built for exactly this and Healthy Eating on a Budget covers how to do a month of cooking without the shopping bill running away. If cooking properly is not possible for you because of time, energy or space, assembled meals from raw ingredients still count - Healthy Eating When You Can't Cook shows what those look like.

Why it works

When you make a meal from ingredients you control everything in it. Most ready-made and restaurant food carries more salt, sugar and fat than the same dish made at home because those are what make it sell and keep, and portions are set by the seller rather than by you. Cooking removes all of that by default. It also tends to pull more vegetables onto the plate simply because they are there and need using. Over 30 days those small shifts add up to a different diet without any counting.

It is not automatic. A homemade pie is still a pie, and cooking at home does not make a meal healthy on its own. What it reliably gives you is knowledge. By the end of the month you will know what goes into the food you eat, what it costs and how long it takes, and you will have a set of meals you can make without a recipe. Healthy Eating Tips is the place to start if you want to use that control well.

Adjust Difficulty

Make it easier: Allow one meal out per week, planned in advance and written on the calendar. Keep breakfast simple and repeat it every day since nobody needs 30 different breakfasts. Cook once and eat twice or three times. Let bread, tinned beans, frozen vegetables and jarred passata do the heavy lifting in week one so you are assembling rather than cooking. If you slip and buy lunch because the day fell apart, cook dinner, tick the day and carry on. One bought sandwich is not a failed month.

Make it harder: Make it from scratch. Bake your own bread, cook dried beans instead of opening a tin, make your own sauces, stock and yoghurt and avoid any mix or shortcut. This is the version the challenge was first written for and it is a serious amount of work. Add a rule that every dinner must contain at least two vegetables. Combining this with the No Salt challenge is possible since you control the seasoning of everything you eat, and it turns a hard month into a very hard one.

What to expect

The first week you will spend far more time on food than you are used to and you will notice how often you used to reach for something ready made without thinking. Expect the shopping bill to jump before it settles, since a full cupboard of ingredients costs more up front and less per meal. Expect at least one evening where you are cooking at 9pm because there was nothing else and one lunch that is just bread and cheese because you forgot to plan. By week two you have a rhythm, a few reliable meals and leftovers in the fridge, and the challenge stops being hard and starts being a routine. By week three eating out will feel like an event rather than a default. By day 30 you will have cooked 90 meals, which is more than most people manage in half a year, and you will know precisely how much of your old diet was chosen for you by whoever made it.