Online, you'll see five to seven days, and in US sources three to four. For Germany, the BfR figure applies, and it's shorter. Here you'll find the rules, a reference guide for 60 dishes and ingredients, and the answers on rice, freezing and boxes. For unopened supplies, a different reference applies: the prepper list.
How long does meal prep keep in the fridge?
Heated dishes two to three days, meals with raw ingredients one day at most: that's the recommendation of the German Federal Institute for Risk Assessment (BfR), and it applies at 7 °C at most, ideally 5 °C. According to the BfR, there's no blanket shelf life; it depends on how hot the food was cooked, how quickly it was cooled and how cold it was stored. US authorities say three to four days, and the shorter figure is the safer yardstick. Sniffing only helps to a limited extent: salmonella and campylobacter change neither smell nor taste.
Can you batch-cook for 5 days?
Yes, but not all of it in the fridge. Five working days from one Sunday only works if you freeze the Thursday and Friday portions straight away on Sunday, or add a second prep session on Wednesday. The Verbraucherzentrale NRW recommends batch-cooking for three days at most; the Verbraucherzentrale Niedersachsen advises putting salads and fish dishes on Monday and Tuesday and fully cooked dishes on Wednesday and Thursday, with the rest coming from the freezer.
Freezing meal prep
Freezing extends shelf life, not quality: at minus 18 °C food stays safe, but it loses moisture and flavour over time. The BfR's method: cool it down, portion it, get as little air as possible into the container, and write the date on it. As a guide by food type, the BfR gives poultry 3 months, beef and pork 3 to 6, fish 6, and cooked vegetables up to 12 months; the BZfE gives 3 to 6 months for leftover rice and stews. Defrost in the fridge overnight, never on the worktop. Don't freeze: salad, hard-boiled eggs and cream sauces, as they turn watery.
Shelf life isn't decided on day three, but in the first hour after cooking. If you leave a hot pot of rice on the hob in the evening, the problem is already there before the box ever reaches the fridge. Spread it out flat and cool it quickly, and your pre-cooked food will keep for the two to three days the BfR mentions.
Joerg Hauke, Nutrition expert, expert review of this article
Reheating properly
The same number applies to reheating as to cooking: at least 70 °C for two minutes throughout. Stir halfway through in the microwave, and bring sauces and soups to the boil. What reheating can't do: destroy toxins that bacteria have produced when food has been left standing too long, such as the heat-stable toxin of Bacillus cereus in rice and pasta. That's why cooling matters more than heating. Despite the old myth, mushroom dishes can be reheated, but only after cooling quickly and at most one day later; the same goes for spinach, as long as it wasn't left warm for long.
Rice and pasta: cooling is the keyBacillus cereus spores survive cooking. If rice sits warm for hours, they germinate and produce a toxin that no amount of reheating will destroy. So spread rice out flat, get it below 7 °C within a few hours and eat it within two to three days; the NRW consumer advice centre even says 24 hours.
Meal prep boxes: glass or plastic?
Either, says the BfR, which names no material as a criterion: airtight, glass-and-fork symbol, thoroughly cleaned, and no bigger than one meal, so leftovers aren't chilled and reheated twice. Only glass, porcelain or plastic labelled for the purpose, such as polypropylene, belongs in the microwave. Melamine resin tableware, often sold as bamboo ware, isn't for hot food or the microwave. Bisphenol A has been banned EU-wide in most food contact materials since January 2025; the transition period for finished products ended in July 2026, and some uses have until 2028. Glass is heavier, plastic scratches, and both work.
