What Is Meal Prep and Why It Actually Works

Meal prep is the practice of cooking and portioning a week's worth of food in a single session — usually a couple of hours on Sunday. The cooked meals go into containers in the fridge (or freezer), ready to grab every day.

The reason it works isn't magic. It's three boring but powerful things:

  • It eliminates daily decisions. Every food decision you have to make is a chance to make a bad one. When lunch is already in the fridge, the decision is already made.
  • It makes hitting your macros predictable. If you know exactly what's in each container — 45g protein, 55g carbs, 12g fat — tracking is almost automatic. No guessing.
  • It's dramatically cheaper than buying lunch out. The average bought lunch costs £8–12 in most cities. A prepped meal costs £2–4. Over 5 days, that's £30–50 back in your pocket every week.

"The best diet is the one you can actually stick to. Meal prep isn't about eating perfectly — it's about making eating well the path of least resistance."

Who Meal Prep Is Actually For

Gym-goers who track macros are the obvious crowd, but meal prep makes sense for anyone who:

  • Cooks the same things on rotation anyway and wants to just do it once
  • Works long hours and makes poor food choices when tired
  • Wants to lose body fat or build muscle consistently (both require dietary consistency, not perfection)
  • Is tired of spending money on food that doesn't match their goals

You don't need to be a bodybuilder. You don't need to eat chicken and rice. You just need to be someone who'd rather cook once and eat well all week than figure it out fresh every single day.

The SoulGainz Method: 1 Session, 7 Days

Our approach is deliberately minimal. Two to three recipes, cooked in parallel, portioned into containers for the full week. It sounds boring — and for some people, it is at first. But the benefit isn't culinary excitement. It's having your food sorted without thinking about it.

Most people who meal prep for a while end up rotating a handful of recipes they genuinely like. You develop a rotation of 8–10 meals you enjoy, and you cycle through them. Novelty isn't the goal. Reliability is.

Step-by-Step: How to Actually Do It

1

Pick your recipes (2–3 max per week)

Choose one or two proteins, one or two carb sources, and some vegetables. You want recipes that hold up well in the fridge for 4–5 days — think rice dishes, baked proteins, roasted veg, grain bowls. Avoid anything with dressed salad leaves, fried eggs, or anything that goes soggy. For lunches and dinners, pick two different things you actually want to eat five times each. If you only want variety in one meal, that's fine — keep breakfast or lunch consistent and vary dinner.

2

Calculate your portions

Figure out how many calories and how much protein you need per meal. If you're eating 2,200 calories a day across three meals, you're roughly aiming for 600–700 calories per main meal. Use a kitchen scale for the first few weeks until you can eyeball it. For protein: if your target is 160g a day across 4 meals, that's 40g protein per meal. A 150g serving of cooked chicken breast is about 40g protein. Simple.

3

Build your shopping list

Take your recipes, multiply the ingredient quantities by the number of servings you need (5 lunches + 5 dinners = 10 portions of each protein), and you've got your shopping list. Add up the total and you'll likely spend £30–50 for the whole week. Shop once, ideally the day before prep day so everything is fresh.

4

Prep day: timing and order of operations

The golden rule is longest cook first. Start anything that goes in the oven or takes time to simmer — a tray of salmon takes 20 minutes, a pot of rice takes 18, a batch of chicken thighs takes 35. While those are running, you chop vegetables, cook grains on the hob, prep sauces. By the time the oven comes out, your stovetop is done. A well-run prep session for two recipes is 90 minutes. Three recipes might be 2–2.5 hours.

5

Store and label

Everything goes into meal-prep containers with matching lids. Glass or BPA-free plastic both work. Label each container with the contents and the date cooked. Meals for days 1–4 go in the fridge. Anything for days 5–7 goes straight in the freezer and comes out the night before you need it. Don't try to keep 7 days of cooked food in the fridge — day 5 onwards will be questionable.

What to Prep vs What to Leave Fresh

Not everything benefits from prepping. Here's a quick split:

  • Prep ahead: cooked proteins (chicken, beef, salmon, eggs), grains (rice, quinoa, pasta), roasted veg, overnight oats, soups and stews, sauces
  • Leave fresh: salad leaves, avocado, anything with crispy texture that matters, fresh herbs as garnish, fried eggs if you care about the yolk

A grain bowl can be prepped entirely except for the fresh herbs and dressing — add those when you serve it. A chicken wrap is fully preppable except for the lettuce if you care about crunch.

Common Mistakes (and How to Avoid Them)

Mistake 1: Prepping too many different recipes

I see this constantly. Someone ambitious on their first prep day tries to make four or five different things. The kitchen becomes chaos, timing goes wrong, cleanup takes forever, and they don't do it again. Start with two things. Master the rhythm. Add a third when two feels easy.

Mistake 2: Not portioning

Cooking in bulk doesn't help if you eat from the pot. Portion everything into individual containers before you put it away. If you cook 1.5kg of chicken breast and you need 150g per serving, weigh it into 10 containers. This takes 10 extra minutes and saves hours of guessing later.

Mistake 3: Wrong containers

Flimsy single-use containers leak and stack badly. Mismatched lids are infuriating. Invest in a set of uniform meal prep containers — either glass (heavier, better for reheating, no plastic taste) or good-quality BPA-free plastic. A set of 10 matching containers costs about £20–30 and lasts years.

Mistake 4: Prepping things that go bad too fast

Dressed salads, anything with avocado, cut fruit — these don't last 5 days. Learn what holds and what doesn't. Rice and chicken hold beautifully. A dressed kale salad holds surprisingly well (kale doesn't wilt like spinach). Anything dressed with vinaigrette is fine. Creamy dressings break down faster.

Frequently Asked Questions

How long does meal prep last in the fridge?
4–5 days is the reliable window for cooked proteins and grains. Day 4 is usually still good, day 5 is borderline depending on the food. For days 5–7, freeze the meals and pull them out the night before. Never eat cooked chicken that's been in the fridge for 6 days.
Can you freeze meal prep?
Yes, and it's underused. Soups, stews, curries, rice dishes, cooked proteins — all freeze well. The exceptions are cooked potato (goes grainy), any dish with cream (separates), and salad-based meals (obviously). Freeze on prep day in individual portions, defrost overnight in the fridge. Reheat thoroughly and eat immediately.
What containers should I use?
Glass containers with locking lids are the gold standard — they don't absorb smells, they're safe in the microwave and oven, and they last. Pyrex or similar brands work well. For volume (if you're doing a lot), quality BPA-free plastic like Prep Naturals or Sistema is more practical. Avoid anything cheap and flimsy — the lids always break first.
How do I actually hit my macros with meal prep?
Weigh your ingredients raw (before cooking, because water weight changes things significantly), log them in your tracking app, then divide by the number of portions. Once a recipe is in your log, you just tap it each meal. Over time, you'll have a small library of prepped meals where you know exactly what's in each container. The first week requires effort. By week three, it's automatic.
Do I have to eat the same thing every day?
No — but most people who meal prep consistently end up doing exactly this, and it stops feeling like a hardship surprisingly quickly. The trick is choosing things you actually enjoy. If you hate chicken breast, don't prep chicken breast. Prep salmon, or turkey mince, or eggs. You're going to eat this 5 times, so make sure you like it on day one.
What if I miss a prep session?
It happens. Keep a few emergency options: tinned fish, Greek yogurt, cottage cheese, eggs, pre-cooked pouches of grains. These aren't as optimised as your usual prep, but they're far better than takeaway when you haven't prepped. One missed week doesn't derail anything — just do a smaller session midweek if needed.

Make This Whole Process Automatic

We built SoulGainz to handle the recipe selection, macro calculation, and shopping list generation — so your only job on prep day is cooking.

Try SoulGainz Free →