Fat loss & nutrition, by the numbers.
The industry sold women restriction when they needed protein, and cardio when they needed weights. Fat loss isn't a mystery — it's three numbers and a bit of patience.
Walk into any newsagent and the magazine rack still tells women the same two stories it told them twenty years ago: eat less, and do more cardio. It's why a generation learned to fear bread, count "syns" instead of calories, and treat the cross-trainer as the centre of a fat-loss plan. What almost none of it taught was the thing that actually decides whether a diet works: protein, and enough resistance training to hold onto muscle while the fat comes off. Diet after diet stripped away muscle along with fat, dropped women's maintenance calories, and set up the rebound that gets blamed on willpower.
Fat loss for women is not complicated and it is not gender-specific magic. It is a calorie deficit you can sustain, built on a protein target high enough to protect your muscle, supported by lifting weights. Get those three right and the scale moves; ignore them and no meal-replacement plan will save you. Everything below is the numbers, the food to hit them with from Tesco, Aldi and Lidl, and the mistakes that keep UK women stuck.
Why women keep losing weight and gaining it back
Most "failed" diets didn't fail because of willpower — they failed because restriction without enough protein or resistance training strips away muscle, lowers your maintenance calories, and makes regain almost inevitable. When you crash-diet, the body takes energy from muscle as well as fat. You finish lighter but with less muscle and a lower metabolic rate, so the old portions now cause weight gain.
The deficit is the engine — but how you build it matters
Every diet that works — 5:2, keto, Slimming World, calorie counting — works for one reason: a calorie deficit. None is magic and none is required. A 300–500 kcal daily deficit produces roughly 0.5kg of loss a week, which is the range that keeps energy and training intact.
Why slower is faster in the end
Aggressive deficits (more than ~600 kcal) accelerate scale loss but cost muscle, tank your gym performance, and rarely last past three weeks. Losing 0.5–1% of body weight a week is the sustainable lane, and sustainability is what separates women who keep the fat off from those who ride the yo-yo.
Set your macros by body weight, not percentages
Percentage splits like "40/30/30" guess your protein; body-weight targets get it right every time, which is why you should set protein first, fat second, then fill the rest with carbohydrates inside your deficit. Protein is the only macro that directly preserves muscle when calories are low — get it wrong and the rest is irrelevant.
| Body weight | Calories | Protein | Fat | Carbs |
|---|---|---|---|---|
| 55–60 kg | 1,500–1,600 | 100–120 g | 45–55 g | 135–160 g |
| 65–70 kg | 1,700–1,900 | 117–140 g | 52–65 g | 150–185 g |
| 75–80 kg | 1,900–2,100 | 135–160 g | 60–75 g | 175–215 g |
The British Nutrition Foundation supports higher protein intakes during weight loss to protect lean tissue and control appetite — the two things that make a deficit survivable.
Hitting protein on a UK supermarket budget
Protein is the macro most women fall short on, but you don't need shakes or "diet" food — own-brand basics from Tesco, Aldi and Lidl hit your target for a few pounds a day. Here's what a single serving of common staples delivers:
Approximate cooked/drained values from own-brand labels.
Anchor every meal with a 20–40g protein source first, then build the rest of the plate around it. Three or four protein-led meals a day gets most women to target without a single supplement.
Don't fear carbs or fat
Carbohydrates fuel your training and mood, and dietary fat keeps your hormones working — cutting either to extremes is why so many women feel exhausted on diets and give up. Once protein and your deficit are set, the carb-to-fat split is preference, not science.
Carbs are training fuel, not the enemy
Women who slash carbs while still training see performance fall within two to three weeks: weights feel heavier, reps drop, recovery slows. Rice, oats and potatoes from any UK supermarket keep the tank full for the price of pennies a portion.
Fat has a floor
Dietary fat supports the hormones that govern mood, metabolism and your cycle. Keep it at roughly 0.8–1.0g/kg minimum — eggs, olive oil and full-fat Greek yoghurt cover it without thought. Eating too little fat for too long disrupts the very hormones the Your Cycle pillar covers in detail.
Fat loss through every life stage
The framework — deficit, protein, strength training — holds from your twenties to menopause; only the numbers and the patience required change. Metabolic rate drifts down with age, perimenopause shifts where fat is stored, and the postnatal body needs recovery before any restriction.
Postnatal: rebuild before you restrict
In the first months after birth — especially while breastfeeding — the priority is recovery, protein and gentle progressive movement, not a deficit. The fat loss comes later and comes easier once strength and routine are back.
Perimenopause: protein up, patience up
Falling oestrogen makes muscle harder to keep, so protein matters more and results come slower. The NHS Eatwell Guide still applies; the emphasis simply shifts towards protein and strength work, as the Your Cycle pillar explains.
Frequently asked questions
How big should my calorie deficit be to lose fat?
For most women, a deficit of 300–500 kcal a day produces steady fat loss of around 0.5kg a week — fast enough to see progress, slow enough to protect muscle and energy. Larger deficits speed up scale loss but increase muscle loss, fatigue and bingeing. The best deficit is the largest one you can hold consistently for months without your training, sleep or mood falling apart.
How much protein do women need for fat loss?
Aim for 1.8–2.2g of protein per kilogram of body weight a day while in a deficit. For a 65kg woman that's roughly 120–140g, spread across meals. Protein is the macro that preserves muscle when calories are low, so it's the one number not to get wrong. The British Nutrition Foundation supports higher protein intakes during weight loss to protect lean tissue and manage appetite.
Should women go low-carb or low-fat to lose weight?
Neither is required. Once protein and your deficit are set, the split between carbs and fat is down to preference and adherence — there's no metabolic advantage to either extreme for women who lift. Carbohydrates fuel training and mood; fat supports hormones. Cutting either to extremes is why many women feel terrible on diets and quit. Choose the balance you'll actually sustain.
Why do I keep losing weight then putting it back on?
Usually because the diet relied on restriction alone, with too little protein and no strength training, so you lost muscle along with fat and your maintenance calories dropped. When you stop, the lower muscle mass makes regain easy. The fix is a moderate deficit, high protein, and resistance training — so the weight you lose is fat, and the muscle that keeps your metabolism up stays.
Can I lose fat eating supermarket own-brand food?
Yes — and it's cheaper. You don't need diet products or shakes. Tesco, Aldi and Lidl own-brand chicken, eggs, Greek yoghurt, tinned tuna, cottage cheese and frozen veg cover protein and nutrition for a few pounds a day. Fat loss is determined by your calorie and protein numbers, not by special 'slimming' foods. Build your basket around protein and vegetables and the rest looks after itself.