How much weight can you lose in 1 month and keep it off?

You want a slimmer figure, and you want it fast. That’s understandable. But losing weight too abruptly can leave your body fatigued and set you up to regain it. This article gives you benchmarks in numbers and explains how to lose weight faster without sacrificing muscle or energy.

Losing 500 g to 1 kg per week is the most common benchmark. This pace corresponds to a moderate calorie deficit. Your body has time to adjust, and your energy stays steady throughout the day.

That figure is still an average. Two people following the same diet won’t lose the same amount of weight. Starting weight, age and physical activity all affect the result.

A high-protein diet can help you lose weight faster, especially during the first few weeks. With the 1-month Cétofine 21 weight-loss program, the goal is to lose up to 6 kg, depending on your circumstances. Some of the weight lost in the first few days is water. Our nutrition advisors help you set a realistic goal.

This pace is possible for a specific reason: a high protein intake helps preserve your muscle mass. The body then draws on its fat stores. A structured plan and follow-up support remain essential.

Drastically restricting food without getting enough protein causes the body to draw on its muscles. Metabolism slows to conserve energy. When you stop the diet, the weight comes back quickly: that’s the yo-yo effect.

Watch for these signs:

• persistent fatigue or dizziness
• hair loss
• irritability
• loss of muscle tone and strength

If you experience any of these symptoms, talk to your doctor.

The higher your starting weight, the faster the initial weight loss. In the first few days, some of the weight lost is water. When carbohydrate intake drops, the body uses its glycogen stores, and glycogen holds water.

Weight loss is never a straight line. Plateaus happen naturally. Weight also fluctuates from day to day with changes in water and salt. Compare your results from one week to the next instead. You can also take measurements (hips, waist, thighs…)

Basal metabolic rate decreases with age. In women, menopause changes how fat is distributed: storing fat around the abdomen becomes more common. Weight loss may therefore be slower, but it is still possible.

The less you move, the less energy your body uses at rest. Even gentle activity gets your muscles working:

• walk for 30 minutes a day
• garden
• take the stairs
• swim or ride a bike at an easy pace

When you sharply reduce carbohydrates and fats, the body has to find another source of energy. The liver then converts fat into ketones, which serve as fuel. This is the state of ketosis.

Your body fat becomes your main energy source. Your figure becomes slimmer. During the first few days, an adjustment period may cause some fatigue or headaches. After that, energy levels stabilize.

A high protein intake helps preserve your muscle mass as you lose weight. You maintain muscle tone and a firm figure.

Protein also helps you feel fuller. You’re less hungry between meals and less tempted to snack. To learn more, explore the role of protein in weight loss.

The Cétofine 21 program progresses step by step. You move from one stage to the next as you lose weight:

1. Stage 1 – Protein diet: the phase with the fastest weight loss.
2. Stage 2 – Modified protein diet: you reintroduce certain foods while continuing to lose weight.
3. Stage 3 – Transition: carbohydrates are gradually reintroduced.
4. Stage 4 – Stabilization: you return to a balanced diet and maintain your new weight.

You don’t have to count calories. The ready-to-follow structure takes some of the mental load off your shoulders. Our high-protein weight-loss programs, lasting 14 to 90 days, include the packets and guide suited to each stage.

Before you begin, find out how to get your high-protein diet off to a good start.

Stages 3 and 4 are what truly set the program apart. If carbohydrates return too quickly, the body rapidly replenishes its reserves. By reintroducing them step by step, you give your body time to adjust to your new weight.

This phase gives you:

• new eating habits that last
• a target weight maintained over time
• a varied diet without feeling deprived

These two stages greatly reduce the risk of regaining weight.

The high-protein diet originated in the 1970s with Professor Blackburn’s research at Harvard University. The method led to rapid weight loss, but many people experienced the yo-yo effect.

Founded in Montpellier in 1996, the Cétofine 21 laboratory built on this research. We added a Transition phase and a Stabilization phase to help people maintain their weight loss. For more than 20 years, our high-protein packets were available only by prescription, with follow-up care from nutrition physicians throughout France. Since 2018, the program has been available online.

• Proteins with high biological value: primarily milk protein, for its complete amino acid profile and excellent digestibility.
• A chemical score above 100 for all our packets.
• Nutrition advisors available by phone to answer your questions at every stage.
• Fast delivery in discreet packaging.

More than 30,000 people have followed the Cétofine 21 program. Our customers give us a rating of 4.8/5 on Google.

A high-protein diet isn't right for everyone. Ask your doctor before starting, especially in these situations:

• pregnancy or breastfeeding
• kidney or liver failure, severe metabolic disorders
• intensive medical treatment
• adolescence, while still growing

To learn more, read our article Who can follow a high-protein diet?

Losing 2 to 4 kilograms per month is a healthy guideline. With a supervised high-protein program, you may lose weight faster at first while preserving muscle. The maintenance phase then makes all the difference in keeping the weight off.

Ready to get started? Explore our one-month weight-loss program, with a goal of losing up to 6 kilograms, or call our nutrition advisors to choose the program that fits your goals.