Build a body that works for life.

Sugary soft drinks

Liquid calories don't fill you up the way food does, so they tend to add to what you eat rather than replace it. Adults are advised to keep free sugars under 30 g a day; one can of regular cola is about 35 g. Frequent sugary drinks also raise the risk of tooth decay.

Sugar-free and diet drinks

No sugar and almost no calories, so swapping from full-sugar versions is one of the simplest ways to cut intake. They're still acidic for teeth, and colas contain caffeine. Water remains the best everyday drink.

Juice and smoothies

Even with no added sugar, the sugar released from juicing or blending fruit counts as free sugar. 150 ml a day counts as one of your 5 a day, however much you drink. Whole fruit is more filling.

Milk, shakes and coffee

Milk brings protein and calcium, and its natural sugar isn't a free sugar. Lattes are mostly milk. Syrups, cream and blended iced drinks turn coffee into dessert: a large frappé can match a meal.

Caffeine and energy drinks

Up to about 400 mg a day is generally considered safe for most adults (200 mg if pregnant). Caffeine late in the day can disrupt sleep, which affects appetite and recovery. Energy drinks combine high caffeine with sugar unless sugar-free.

Alcohol

Alcohol has 7 kcal per gram, nearly as much as fat. UK guidance is no more than 14 units a week, spread over three or more days with several drink-free days. It disrupts sleep, lowers inhibitions around food, and heavy drinking after training can blunt muscle repair.

Own the reps

Use a full range you control. Early on, stop each set with 2–4 reps still in the tank (“reps in reserve”).

Double progression

Stay at a weight until every set hits the top of the rep range with clean form. Then add the smallest load jump, or a harder variation.

Recover

Rest 1–3 minutes on big lifts. If sleep, soreness and performance all slide, cut sets by about a third for a week.

A deficit drives weight loss

Across weeks, eating less energy than you use means stored energy makes up the gap. Many diets work if they create a deficit you can keep. As you get lighter, your expenditure falls a little too.

Lifting plus protein

Resistance training signals your body to keep muscle; protein supplies the building blocks. A moderate deficit improves the odds that most of what you lose is fat.

The best plan is repeatable

Food preferences, budget, culture, shifts and stress all matter. A perfect plan you can't follow does nothing.

Every working diet creates a deficit

Diets get you there in different ways: banning food groups, limiting eating times, raising protein and fibre, or tracking. None beats energy balance; they're different routes to eating less.

Head-to-head, results converge

In a large year-long US trial (DIETFITS), people on a healthy low-carb diet and a healthy low-fat diet lost similar amounts. Results varied hugely between people within each group, mostly down to how well they stuck to it.

What predicts lasting results

A pattern you enjoy and can keep, enough protein and fibre, regular strength training, decent sleep, support or accountability, and a plan for maintenance after the diet ends.

How to spot a fad

• Promises fast loss (more than about 1 kg a week) that lasts
• Bans whole food groups without a medical reason
• Says one food, gene, blood type or hormone is the secret
• Talks about ‘toxins’, ‘detox’ or ‘resetting’ your body
• Needs special products, teas or supplements
• Relies on testimonials and before-and-after photos, not trials
• Makes you feel guilty or ‘dirty’ about normal food

When to get help

Talk to your GP or a registered dietitian before a restrictive diet if you take medication for diabetes or blood pressure, have kidney, liver or heart disease, are pregnant or breastfeeding, are under 18, or have a history of eating disorders. If dieting is making you anxious about food, Beat (the UK eating disorder charity) can help: 0808 801 0677.

Protein: how much and from where

The baseline for adults is about 0.75 g per kg of body weight a day. If you lift, are dieting to lose fat, or are over 65, 1.2–1.6 g per kg is a better target, and up to about 2 g per kg helps keep muscle in a hard deficit. Spread it over 3–4 meals of 20–40 g. Mix sources: animal proteins are complete; plant eaters get the full set by combining beans, lentils, grains, soya, nuts and seeds over the day.

Carbohydrates: quality and timing

Most carbs should come from wholegrains, potatoes with skins, beans, fruit and veg. Keep free sugars (added sugar, honey, syrups, juice) under 30 g a day. Put more of your starchy carbs around training and less on rest days if you're cutting.

There's a natural dip

Alertness naturally dips in the early afternoon, roughly 1–3 pm, even if you skip lunch. Short sleep makes this dip much deeper, so food is only part of the picture.

Big meals hit hardest

Large meals are the most consistent trigger of sleepiness after eating. Both very carb-heavy and very fatty meals are linked to it, and they're worst together: think pasty and crisps, or curry with naan and pilau.

Fast rise, then a dip

Fast-digesting carbs with little protein or fibre cause a quick blood-sugar rise. In some people a dip follows 2–3 hours later, which research links to feeling hungry again and eating more. Protein, fibre and slower carbs flatten the curve.

What makes the slump worse

• A lunch over about 800 kcal
• White bread, baguettes, naan, pilau, chips, battered food, pastry and sticky or sushi rice as the main event
• Sugary drinks, juice or a smoothie with the meal
• Little protein (under 20 g) and little fibre
• Alcohol at lunchtime
• Eating fast at your desk, then sitting still
• Short sleep, dehydration and too much caffeine late the day before

What helps

• A lunch of roughly 400–600 kcal, with a protein snack later if you need it
• 25–40 g protein and 8 g+ fibre: beans, lentils, wholegrains, vegetables
• Half the plate vegetables or salad
• Vegetables and protein first, carbs last
• Water or sugar-free drinks
• A 10–15 minute walk after eating, ideally outside in daylight
• Caffeine before about 2 pm only
• Consistent sleep

Energy balance drives it

Over weeks, eating more energy than you burn leads to weight gain, whether the extra comes from fat, carbs, protein or alcohol. Calorie for calorie, fat isn't more fattening than carbs.

But fat packs calories in

Fat has 9 kcal a gram, alcohol 7, carbs and protein 4. That's why a free-poured glug of oil (about 360 kcal), butter on toast or a creamy sauce can quietly double a meal without making it look bigger.

Not every calorie fills you equally

Protein is the most filling nutrient and takes the most energy to digest. Fibre adds bulk. Liquid calories and very processed, energy-dense snacks are the easiest to overeat: in one controlled US trial, people ate about 500 kcal a day more on an ultra-processed diet.

Saturated vs unsaturated fat

Same calories, different effects. Saturated fat, found in butter, ghee, cheese, cream, fatty and processed meat, pastry, palm and coconut oil, raises LDL cholesterol, a major cause of heart disease. Unsaturated fat in olive and rapeseed oil, nuts, seeds, avocado and oily fish helps lower LDL when it replaces saturated fat. UK guidance: no more than 30 g of saturated fat a day for men and 20 g for women.

Does fat type change where fat is stored?

Possibly. In one small overfeeding trial, extra calories from saturated fat (palm oil) increased liver and visceral (deep belly) fat more than the same extra calories from polyunsaturated fat (sunflower oil), with similar weight gain. It's early evidence, but it points the same way as the heart evidence: choose unsaturated fats.

Sugar and salt

Sugar has the same 4 kcal a gram as other carbs, but free sugars in drinks and sweets are easy to overconsume and don't fill you. Salt has no calories, but it holds water, so a salty takeaway can show up as a heavier scale reading the next day, and it raises blood pressure. The limit is 6 g a day.

What to do with this

Use calories to steer weight. Use protein and fibre to stay full. Swap saturated fats for unsaturated ones where you can, and measure cooking fat rather than pouring it. The ingredient guide shows all three for each food.

Heart and circulation

Swap some saturated fat (fatty or processed meat, butter, pastries) for unsaturated fats (olive or rapeseed oil, nuts, seeds, oily fish). Choose oats, beans, lentils, fruit and vegetables. No single food clears arteries.

Can fat turn into muscle?

No. They are different tissues. Recomposition means losing fat and gaining muscle at the same time, which works best for beginners, people returning after a break, and people with more fat to lose.

Anchor meals to waking

A consistent pattern helps. Shift workers: eat your main meal in your biological daytime where you can, and plan lighter food overnight instead of grazing.

Spread protein out

Aim for 3–4 protein-containing meals, often 25–40 g each. Daily total matters more than a narrow post-workout window.

Protect sleep

Finish big meals 2–3 hours before bed if reflux or poor sleep is an issue. Keep caffeine to the first half of your waking day.

Weight trend

0.25–1% of bodyweight a week is a sustainable range. Leaner or highly trained people should favour the slower end.

Lean gain

A small surplus of about 100–250 kcal a day. Watch the monthly trend and your waist. Faster scale gain is not more muscle.

Recomposition

Eat near maintenance, lift consistently and hit protein. Judge by waist, photos and performance together.