Reduce food waste at home — where the real leverage is

In Switzerland, around 2.8 million tonnes of food waste are produced every year (FOEN 2022). About 38 % of it comes from private households — the single largest item along the entire food chain, bigger than restaurants, bigger than retail.

Converted to one person: ~90 kg per year. That's roughly:

• 2 loaves of bread per week
• 1 kg of fruit and vegetables per week that never reached a plate
• 1 meal per day that ends up in the bin instead of the stomach

The figures from Germany (12 million tonnes / year, ~59 % of it households) and Austria are similar. The EU as a whole throws away around 88 million tonnes of food per year (EU estimate 2020).

What exactly gets thrown away?

• Fresh fruit and vegetables — ~30 % of waste. What wilts in the fridge because you «will still use it».
• Bread and baked goods — ~16 %. Bought on Friday, already too dry for a sandwich by Monday.
• Leftovers — ~22 %. Meals that were too much, forgotten over the weekend.
• Dairy — ~10 %. Best-before date passed without anyone tasting it.
• Things bought but never used — the rest. The bunch of herbs bought by mistake. A sauce that didn't fit the recipe.

The most important observation: the source of waste is almost never «bad» storage — fridge temperature, freezing, etc. are minor levers. The big levers sit much earlier: at the shopping and planning decision.

The single biggest lever against food waste is, absurdly, not a fridge trick — it's the weekly plan made before shopping.

Why: without a plan, you buy «just in case». You walk through the Coop, see leeks (delicious, you thought about them last week already), grab two. You move on, see a squash (looks good, maybe), grab one. Aubergines, because you wanted to «do aubergine again». At home: 8 vegetables, no plan. Three of them still aren't used up by Wednesday, and by Friday they're already looking sad.

With a weekly plan you buy for concrete meals:

• Monday: lentil soup → 1 carrot, 1 leek, 200 g lentils
• Tuesday: pasta → 1 onion, 4 tomatoes
• Wednesday: bowl with leftovers → 1 avocado
• ...

The shopping list has exactly these quantities. You don't buy leeks «on a hunch» — if no meal needs leeks, no leeks go in the cart. That's not less variety — it's fewer gut-feeling buys.

In studies on weekly planning (Stancu et al. 2016, Aarhus University), the household waste rate drops by 30–40 % when planning is done consistently. That's the volume effect nothing else achieves.

In mangia, the path from weekly plan to shopping list is the core. You plan, mangia automatically merges identical ingredients (3 recipes with onion = 3 onions on one line, not 3 entries), and you buy exactly that. Effort: 15 minutes on Sunday. Effect: a third less waste.

The second biggest lever is mundane: 30 seconds of looking in the fridge before shopping. Sounds obvious, but in reality ~60 % of households forget it regularly (Eurobarometer 2023).

The effect is big because double-buying is one of the most common reasons for waste. You buy yoghurt because you had it in your head «I think the yoghurt's run out» — at home there are still two pots. Both go off, one gets thrown away.

The stock check works in three steps:

1. Before shopping, 30 seconds in the fridge: what's still there? What needs to go?
2. Before shopping, 30 seconds in the pantry: pasta, rice, tins, oil — what's running low?
3. Mid-point on the shopping list: what you saw gets dropped if you still have it.

In mangia, the recipe search by ingredients helps you: you type the leftovers you spotted, comma-separated, into the search field («carrot, courgette, cream cheese») and immediately see what you can make from them — before you go to the shop and needlessly buy more.

An automatic stock tracker (e.g. via photo recognition in the fridge) doesn't exist today — it's on our wishlist, but we don't promise it. The manual look in the fridge is still the more precise route today.

The third lever, almost as effective as the weekly plan: one day a week deliberately without a new recipe.

In practice: Friday or Saturday evening is empty in the weekly plan. What gets cooked that evening is decided on the day itself — from whatever's left.

Why it works: in a normal week, 5-6 main meals create leftovers — half a courgette from Tuesday, a bit of rice from Thursday, a few tomatoes that didn't go in the sauce. If the next recipe is already planned for Sunday and needs new ingredients, the leftovers sit there. They sit until they go bad — and end up in the bin.

With a leftover day, the fridge is systematically cleared out at the end of the week. Leftovers become:

• A leftover stir-fry: pasta + leftover veg + cheese, 15 minutes.
• A leftover soup: veg scraps + stock + bread, 25 minutes.
• A leftover bowl: rice + everything that's left, with a sauce, 10 minutes.
• An omelette: eggs + all the small quantities, 8 minutes.

These aren't fine-dining meals, but they are: tasty, fast, and they catch a huge share of what would otherwise go in the bin.

In mangia you simply leave one day empty in the weekly plan and, for that day, use the ingredient search («show me recipes with carrot, pasta, cream»). That gives 5–10 suggestions that fit your leftovers exactly — you type in the leftovers and immediately see what you can cook from them.

The last two levers are smaller than plan / stock check / leftover day, but together they make a real difference.

Best-before is not an expiry date. The best-before date tells you: «up to this day the manufacturer guarantees quality». It does not say: «after this it's bad». Yoghurt 3 weeks past best-before is usually perfectly fine, milk 1 week often too (smell, taste a little — if it's okay, eat it). Tins are fine for years past best-before.

Mind the difference:

• Best-before (best before): a quality statement, not a safety statement → taste / smell / look, then decide.
• Use-by date (use by): safety-relevant, applies to fresh meat, fish, minced meat → follow more strictly.

Most foods have a best-before, not a use-by date. That's the difference. Whoever throws everything away on the best-before day throws away 30-40 % of good food.

Storage is a smaller lever, but not negligible overall:

• Tomatoes not in the fridge — they lose flavour. On the worktop.
• Bread not in a plastic bag — it moulds faster. In a cloth bag or bread bin.
• Herbs in a glass of water like cut flowers → they keep 5-7 days instead of 2.
• Salad wrapped in kitchen paper in the veg drawer → +5 days of life.
• Avocado to keep with the stone in the half, halved with lemon juice, cling film tight on the cut surface.

These tricks aren't «20 % less food waste» — more like 5-10 %. But they cost zero effort once established as a habit.

It's worth putting the levers into numbers once — they often feel so abstract that you don't take them seriously.

Money: an average Swiss 2-person household spends about 1,000–1,400 CHF / month on food. If a third of that ends up in the bin, that's ~350–450 CHF / month of thrown-away money, or 4,200–5,400 CHF / year.

If, through the levers above, you cut your waste rate from ~33 % to ~15 % (realistic after 3 months of consistent application), you save 150–250 CHF / month. Over the year: 1,800–3,000 CHF.

What does the app cost? mangia is free in its basic version. If you want the Pro features (nutrition balance, taste profile per child; 6.90 CHF / month), that's 49 CHF / year. You pay 49, you save 1,800–3,000. The ratio works because the problem isn't the app, the problem is the missing structure — the app is just the tool for it.

Climate: about a third of the climate-gas burden from food is generated without anyone eating the food. Whoever halves their waste rate cuts their diet-related climate gases by around 10-15 % (Poore & Nemecek 2018). That's a big climate effect for a small behaviour change.

At household level: a 2-person household causes on average around 3.5 tonnes of climate gases per year from diet alone. Halved waste rate = around 350-500 kg less per year. That's roughly 1,500-2,000 km of driving.

So the levers pay off threefold: less money gone, fewer climate gases, less stress from the «I've got to throw something out again» feeling.