Read this disclaimer first. This is not medical advice. Calorie deficits are not appropriate for everyone: pregnant or breastfeeding people, people with a history of disordered eating, people with certain medical conditions, and people on medications that interact with food should not change their eating without a qualified professional. If you are in any of those categories, treat this article as background reading, not a plan.
Now: assuming you're not, let's talk about what makes a deficit week work without it being miserable. The Dietrack meal planner for weight loss is the app version of this; you can still plan from the ingredients you already have. The manual version is below.
What "deficit" actually means
A calorie deficit means eating less than your body burns over time. People often plan 250–500 kcal/day below maintenance. That is a range, not a medical prescription. There are no magic foods or timing windows. The deficit does the work; the planning makes it livable.
A simple “250 kcal/day equals 0.25 kg of fat a week” line uses a static calorie-to-kilo conversion. Real bodyweight response is slower (water, glycogen, falling expenditure as weight drops). Hall and colleagues modelled this in The Lancet, 2011: the scale does not pay out a neat weekly kilogram for a neat daily deficit.
Bigger deficits are not reliably faster long-term. They are faster short-term, then many people stop.
The 4 levers (volume, protein, fat, satisfaction)
When you cut calories, the trade-off is between calories and satiety. The four levers that keep meals satisfying at lower calories:
Lever 1. Volume
More food, fewer calories per gram. Vegetables, broths, fruits, popcorn, salads. They take up stomach space; the brain reads "full".
The high-volume meals: a giant salad with a small protein. Soup as a starter. Roasted vegetables as a side. The whole high-volume eating philosophy is its own article, and it's a useful lever in any deficit.
Lever 2. Protein
Protein is the most filling macro. In a deficit, bias toward 1.8–2.2g/kg body weight (see how to set your macros for the math). Greek yogurt, eggs, chicken thigh, lentils, tinned tuna, cottage cheese. The proteins that don't require a project to prepare.
Lever 3. Fat
Fat is calorie-dense (9 kcal/g vs 4 for protein and carbs), so cutting it cuts calories fast. But don't go below 0.6g/kg. Hormones, satiety, and the basic enjoyment of eating depend on some fat. Drop the cooking oil, not the avocado.
Lever 4. Satisfaction
The lever everyone forgets. A meal you actually like at 600 kcal beats a meal you don't at 450 kcal, because the second one leads to snacking. Plan meals you want to eat, not meals you've been told to eat.
A week of meals (with substitutions)
A working template for ~1800 kcal/day. Adjust portions for your target.
| Day | Breakfast | Lunch | Dinner | Snack |
|---|---|---|---|---|
| Mon | Greek yogurt + berries + honey (350) | Chicken-and-rice bowl (500) | Salmon + roasted veg (550) | Apple + peanut butter (250) |
| Tue | Two eggs + toast + tomato (400) | Lentil soup + bread (450) | Chicken stir-fry + rice (550) | Cottage cheese (200) |
| Wed | Oats + banana + walnuts (400) | Tuna salad + crackers (450) | Pasta with vegetables (550) | Yogurt + honey (250) |
| Thu | Greek yogurt + granola (400) | Chicken wrap (500) | Lentil curry + rice (500) | Fruit (200) |
| Fri | Eggs + smoked salmon + toast (450) | Chicken salad bowl (500) | Pizza night (~700) | Skip (pizza budget) |
| Sat | Brunch out (~700) | Light snack (250) | Roast chicken + salad (500) | (covered) |
| Sun | Oats + fruit (400) | Big salad with protein (500) | Stir-fry from leftovers (500) | Yogurt (200) |
Substitutions:
- Vegetarian: swap chicken for tofu/lentils; salmon for halloumi or tempeh.
- No dairy: oat yogurt; coconut yogurt; pumpkin seeds for cottage cheese.
- Higher carb: more rice/oats, less fat in cooking.
- Lower carb: more vegetables, more fat (avocado/olive oil), less rice/pasta.
Hunger, not just calories
In a deficit, you'll feel some hunger. That's the deal: your body is asking for more, and you're choosing to eat less. The job of the plan is to make hunger manageable, not absent.
What helps:
- Protein at every meal. Including breakfast.
- Fibre at every meal. Vegetables, lentils, whole grains.
- Liquid before food. Water, sparkling water, tea. Not as a trick; as a normal habit.
- Sleep. Under-rested people eat more. Sleep is a deficit lever.
- Don't skip meals. Skipping leads to over-eating later, almost always.
When to take a break
After 12–16 weeks in a deficit, take a 1–2 week diet break and eat at maintenance. This isn't cheating; it's biology. Long deficits down-regulate metabolism, hunger hormones rise, and adherence falls off a cliff. A break resets and lets you do another 12-week cycle.
If you've been at it for 8 weeks and have stopped losing weight: adjust calories down by 100 kcal, or take a break first then adjust. Don't crank the deficit harder; the body adapts.
FAQ
How fast should I lose weight?
0.25–0.5 kg/week is the sustainable range. Faster usually means losing more muscle alongside fat, and is harder to maintain.
What if I'm hungry all the time?
Two checks: (1) Are you hitting protein? (2) Are you hitting volume (vegetables)? Most "always hungry" deficits fail on one of these. Adjust before assuming the calorie level is wrong.
Can I drink alcohol in a deficit?
You can. It costs calories that do not satiate. One drink can be budgeted. Three drinks is the night that derails the week.
Is this safe long-term?
Indefinitely sustained large deficits aren't healthy. The cycle approach (12-week diet, 1–2 week break, repeat or maintain) is the more durable pattern. If you are cycling forever, that is also a reason to revisit the goal. Maintaining at a slightly heavier weight than you wanted can be a happier life than always being 4kg from the number.
For a worked example of an actual week, see what a sustainable weight-loss week of eating actually looks like.
