How to Lose Body Fat as Quickly and Safely as Possible

There is a lot of nonsense around fat loss: detoxes, fat burners, fasted cardio and diets that ban entire food groups. The truth is simpler:

The fastest safe way to lose fat is to create a calorie deficit you can maintain while eating properly, training well and preserving muscle.

Crash diets may make the scales fall quickly, but some of that loss will be water and muscle—and they are far more likely to leave you exhausted, hungry and back where you started.

How quickly should you lose weight?

The NHS recommends aiming for around 0.5–1kg per week. Someone with more weight to lose can usually progress faster, while a lighter or already lean person should aim towards the lower end.

Judge progress using your average weight across the week—not one random weigh-in. Water, salt, carbohydrates, digestion and the menstrual cycle can all change scale weight without reflecting fat gain or loss.

The five things that matter

1. Create a sensible calorie deficit

Start around 300–600 calories below maintenance per day. Follow it consistently for two weeks, then assess the trend. If your average weight is not moving, slightly reduce your portions or increase your activity. If it is falling very quickly and your energy or training are suffering, eat a little more.

Low-carbohydrate diets, fasting and calorie counting can all work because they help some people eat fewer calories. Choose the method you can sustain.

2. Prioritise protein and filling foods

Build each meal around protein, vegetables or fruit, a sensible carbohydrate portion and some healthy fats. For someone who strength trains, around 1.6g of protein per kilogram of body weight per day is a useful target for fullness, recovery and retaining muscle.

The easiest calories to remove are often alcohol, sugary drinks, large milky coffees, sauces, cooking oils and unplanned snacks. You do not have to ban them, but they still count.

3. Strength train at least twice per week

Strength training gives your body a reason to retain muscle. Two or three well-programmed full-body sessions per week will be enough for many people. Do not replace proper training with endless burpees simply because you want to lose fat.

4. Walk more

Walking increases energy expenditure without creating much fatigue. There is no magic target: look at your current average and build from there. An extra walk through Ravenscourt Park, along the Thames or during your commute around Hammersmith all counts.

5. Use cardio sensibly

Add one or two cardio sessions you can recover from. Cycling, rowing, running, brisk walking and the SkiErg all work. Cardio helps, but you cannot reliably out-train an excessive diet.

A simple two-week plan

For the next 14 days:

• Eat three structured meals each day containing protein.

• Maintain a moderate calorie deficit.

• Strength train two or three times per week.

• Add roughly 2,000 daily steps if realistic.

• Complete one or two manageable cardio sessions.

• Keep alcohol and liquid calories low.

• Weigh yourself several mornings per week and compare weekly averages.

  
  

After two consistent weeks, make the smallest adjustment needed. Do not overhaul the plan because the scales have not moved for three days.

What about weight-loss injections?

Prescription medicines such as semaglutide and tirzepatide can be effective for eligible people living with overweight or obesity. They are medical treatments—not gym supplements—and should be prescribed and monitored by a qualified healthcare professional.

Very-low-energy diets below 800 calories per day are also clinical interventions, not DIY fat-loss plans.

The honest answer

The fastest safe plan is not the most extreme one you can survive. It is the most assertive one you can repeat while keeping your health, muscle and normal life intact.

Create a controlled calorie deficit. Eat enough protein. Strength train. Walk more. Use cardio sensibly. Track the trend and adjust from evidence rather than emotion.

If you would like help applying this to your own life, REVIVAL offers one-to-one and small-group personal training in Hammersmith, close to Ravenscourt Park and Chiswick.

Get in touch with REVIVAL to find the right place to start.

This is general guidance for healthy adults. Anyone who is pregnant, under 18, has a history of disordered eating or has a relevant medical condition should seek appropriate professional advice before attempting weight loss.