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OUR GP — Dundee · Weight Management

How to Lose Weight
Safely

Learn how to lose weight safely with practical, NHS-based healthy eating advice for adults living with overweight or obesity — plus GP support when you need it.

NHS-based advice0.5–1kg a weekGP supportDietitian referral
5–10% weight loss improves health
0.5–1kg (1–2lb) a week is safe
Half your plate vegetables
150 minutes activity a week

Want personal support with your weight?

Our GPs can check your health, agree realistic goals and refer you to a dietitian or NHS weight management service.

GP consultation
Why it matters

Why Losing Even a Little Weight Helps

You do not need to reach a “healthy” BMI to feel the benefit.

Want to know how to lose weight safely and keep it off? Losing weight slowly and steadily, by making small changes you can stick to, is the healthiest way to reach a healthier weight. This advice brings together trusted guidance from the NHS, NHS Inform, the British Nutrition Foundation and the British Dietetic Association.

Losing 5 to 10% of your body weight consistently improves health, and even 3% can lower the risk of type 2 diabetes, high blood pressure, heart disease, stroke and some cancers.

If you weigh5% weight loss10% weight loss
80kg (12st 8lb)4kg (9lb)8kg (18lb)
90kg (14st 2lb)4.5kg (10lb)9kg (20lb)
100kg (15st 10lb)5kg (11lb)10kg (22lb)
110kg (17st 5lb)5.5kg (12lb)11kg (24lb)
120kg (18st 13lb)6kg (13lb)12kg (26lb)

Fat stored around the tummy carries the most health risk. Therefore, a shrinking waist is a great sign. Check your BMI with the NHS BMI calculator.

Getting started

Lose Weight Safely: How Much a Week?

To lose weight safely, aim for 0.5 to 1kg (1 to 2lb) a week.

Slow, steady weight loss is more likely to stay off than crash dieting. In fact, small changes add up: eating just 100 kcal less a day (about half a plain digestive) could mean around 5kg less over a year.

1

Keep a food and mood diary

For 3 to 7 days, write down everything you eat and drink, when, and how you felt. As a result, patterns soon show up, such as snacking when stressed, bored or tired.

2

Create a small calorie deficit

Eating about 600 calories a day less than you need is a common target: roughly 1,400 kcal a day for women and 1,900 kcal a day for men.

3

Pick 2 to 3 small changes

Don’t overhaul everything at once. Instead, choose a few changes you feel confident you can keep up.

4

Make each goal SMART

Specific, measurable, achievable, relevant and time-bound — for example, “From today I’ll have 2 portions of vegetables a day and tick them off in my diary.”

5

Review and build on it

If a goal feels too hard, change it. Then, as habits stick, add new goals and keep tracking your progress.

Healthy eating

Healthy Eating to Lose Weight: Build a Balanced Plate

Eating a balanced diet is the simplest way to lose weight safely.

A healthy diet to lose weight is based on the Eatwell Guide. Aim for 3 regular meals a day. Also, don’t skip meals, because skipping makes grazing on high-calorie snacks more likely.

Food groupWhat to aim forEasy swaps and tips
Vegetables & fruitAt least 5 A Day (80g = 1 portion); 2+ portions of veg at your main mealFresh, frozen and tinned all count; vary the colours
ProteinSome at every meal: beans, lentils, fish, eggs, tofu, lean meatKeeps you fuller for longer; eat less red and processed meat; bulk out mince with beans or lentils
Fish2 portions a week, 1 of them oily (salmon, mackerel, sardines)Tinned fish is a cheap option
Starchy foodsNo more than a third of what you eat; choose wholegrainBrown rice, wholemeal pasta and bread, oats, potatoes with skins
Dairy & alternativesLower fat and lower sugarSemi-skimmed or 1% milk, reduced-fat cheese, plain low-fat yoghurt
Oils & spreadsSmall amounts only — all are high in caloriesOlive, rapeseed or sunflower oil; measure oil with a teaspoon
Everyday choices

Drinks, Healthy Snacks and Food Labels

Don’t drink your calories — and keep treats as treats.

No food has to be banned. However, crisps, chocolate, cakes and biscuits are best kept as occasional treats in small amounts.

Water first

Have 6 to 8 cups (1.5 to 2 litres) of fluid a day. Water, lower-fat milk, tea, coffee and sugar-free drinks all count.

Limit juice & smoothies

No more than 150ml a day in total. Swap sugary soft drinks for water or sugar-free versions.

Cut down on alcohol

It’s high in calories and, in addition, can make you hungrier. Keep to 14 units a week or less (a pint of 4% lager is about 2.3 units).

Read food labels

Check calories per portion and use the traffic-light colours: choose more greens and ambers, fewer reds.

Cook smarter: bake, grill, steam, poach, air-fry or microwave instead of frying. Similarly, plan meals, shop with a list and batch-cook so takeaways are less tempting. The NHS has over 100 healthy recipes under 600 kcal.

Choosing an approach

Which Diet Is Best for Weight Loss?

The best diet is the one you can stick to.

There is no single best diet. Instead, the best way to lose weight safely is to choose an approach built on healthy eating with a calorie and portion limit, that fits your lifestyle and budget.

ApproachWhat it isThings to consider
Calorie countingA daily calorie allowance, often tracked with an appNo foods off limits; can be time-consuming
Low-fat dietCutting high-fat foods (fat has twice the calories of carbs or protein)Still limit sugar; keep some oily fish
Low-carb dietAround 50 to 130g carbs a dayKeep some fruit, veg and wholegrains for fibre
Slimming clubs & appsGroup or online support with a points or calorie planSupport helps; may cost money; some are free via NHS referral
Intermittent fasting (5:2, 16:8)Eating within set times or daysNot suitable with some medicines or a history of eating disorders
Soups & shakes (total diet replacement)800 to 1,200 kcal a day for up to 12 weeksOnly with medical and dietitian support

Beware of fad diets

Be wary of any diet that promises fast or effortless weight loss, cuts out whole food groups, relies on “miracle” foods or detoxes, or needs you to buy supplements. In short, if it sounds too good to be true, it probably is.

Move more, stay on track

Exercise and Tips to Lose Weight Safely for Good

Activity helps you keep weight off and is good for your heart, mood and joints.

Exercise on its own rarely causes big weight loss. However, being active helps you lose weight safely and keep it off. Also, remember that slip-ups are normal. What matters is getting straight back on track at the next meal.

  • Start small: sit less, take the stairs, get off the bus a stop early
  • Build up to 150 minutes of moderate activity a week, such as brisk walking, cycling or swimming
  • Add muscle-strengthening activity 2 days a week, like bodyweight exercises or yoga
  • Choose something you enjoy and do it with a friend
  • Keep tracking food with a diary, photos or an app
  • Have a list of non-food things to do when bored or stressed
  • Plan ahead for meals out: two courses instead of three, or share a dessert
  • Tell someone you trust about your plan for support
  • Once you reach your goal, keep the new habits
Your questions

Frequently Asked Questions

Common questions about how to lose weight safely.

Click a question to see the answer. If your question isn’t here, call us or book a GP consultation.

Losing weight safely

Eat a balanced diet with smaller portions, cut down on sugary drinks, alcohol and high-calorie snacks, and move more. Aim to lose 0.5 to 1kg (1 to 2lb) a week — a safe and realistic rate.
Most adults should aim for 0.5 to 1kg (1 to 2lb) a week. Slow, steady weight loss is more likely to stay off than crash dieting.
As a guide, around 1,400 kcal a day for women and 1,900 kcal a day for men creates a deficit of about 600 calories. Your needs depend on your age, size and activity — the free NHS Weight Loss Plan app can give you a personal target.
Rapid weight loss from crash or fad diets is usually hard to keep up and can harm your health. Very low calorie plans are sometimes used, for example to help put type 2 diabetes into remission, but only with medical supervision.
There’s no single best diet. For example, low-fat, low-carb, calorie counting and intermittent fasting can all work — the best one is the one you can stick to, based on healthy eating.

Getting help from OUR GP

Weight-loss medicines, including injections, can help some people with a higher BMI and related health problems, alongside changes to diet and activity. They must be prescribed by a qualified health professional — never buy them online without a prescription. Book a GP consultation to find out if they could be suitable for you.
Yes. Our GPs can help you set goals, check your health with blood tests or a health screening, and refer you to a dietitian or an NHS weight management service if you need more support.
Speak to us before changing your diet if you have a medical condition, follow a special diet for your health, take regular medicines, are pregnant, or have (or have had) an eating disorder.

This page gives general weight loss advice for adults and is not a substitute for individual advice from a health professional. Sources: British Nutrition Foundation, NHS Better Health, British Dietetic Association, NHS obesity treatment and NHS Inform. Last reviewed October 2026.

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