How to lose 5 kg in a month, realistically

Five kilos in a month works out at a little over one kilo a week. It is an ambitious target, and how you lose the weight matters as much as the number on the scale.

Is losing 5 kg in a month realistic?

For many people, it is. The US Centers for Disease Control and Prevention states that people who lose weight at a gradual, steady pace of around 0.5 kg to 1 kg a week are more likely to keep it off than people who lose it faster.

Our endocrinologists typically observe weight loss of three to four kilos per month in patients on a medically supervised programme. A 5 kg month may be achievable for patients starting at a higher weight without a calorie deficit large enough to risk muscle loss.

Losing five kilos in one month is different from maintaining that rate over several months. The first month is often when weight loss is fastest, for the reasons below.

What a 5 kg month requires

The calorie deficit involved

The NHS describes reducing daily calorie intake by around 600 calories as a safe and sustainable approach to weight loss. This is broadly consistent with the CDC’s recommended gradual weight loss of around 0.5 kg to 1 kg per week.

There is no single calorie target that applies to every person, because the number depends on your weight, height, age and activity. Our lifestyle coaches calculate it from your body composition analysis and adjust it according to how your weight changes over the first two weeks.

In practice, a 600-calorie reduction is smaller than it may sound. It is a sweetened coffee and a pastry, or a large plate of rice swapped for a smaller one with extra vegetables.

Why weight often falls faster in the first weeks

Weight often falls more quickly in the first week or two, partly because of changes in body water. Your body stores carbohydrates as glycogen, which is stored together with water. When glycogen stores decrease, some of that water is lost too.

This is important when looking at a one-month weight loss goal. Losing 2 kg in the first week does not mean you have lost 2 kg of body fat, and weight loss will not necessarily continue at the same rate. Some patients start to see changes within the first couple of weeks, while others take longer.

Starting weight also matters. Someone starting at 110 kg may lose more weight over the same period than someone starting at 72 kg, as energy requirements and the relative size of the calorie deficit differ.

How to lose 5 kg without losing muscle

With a 5 kg weight loss target, what you lose matters as much as the number on the scale. Losing primarily body fat can improve body composition and metabolic health, while significant muscle loss can affect strength, metabolic health and weight maintenance.

Protein

A review in the journal Nutrients concluded that protein intakes above the standard 0.8 g per kilogram guideline protect fat-free and skeletal muscle mass during weight loss, working either separately or together with exercise. General guidance such as the International Society of Sports Nutrition suggests roughly 1.2 to 1.6 g per kg of body weight per day for people losing weight.

In practical terms, that means including protein at every meal rather than concentrating it in one. Eggs at breakfast, chicken or fish at lunch, lentils or labneh as part of dinner, and Greek yoghurt as a snack are practical examples. These foods can help you reach your protein target, with the amount adjusted to your individual needs. Our lifestyle coaches will personalise the figure from your body composition analysis and build it around what you already eat.

Resistance training

A retrospective study of 304 adults on a calorie-restricted diet, published in Frontiers in Endocrinology, found that resistance training produced the greatest reduction in fat mass and was the only form of exercise associated with an increase in fat-free mass.

Two to three sessions a week can help preserve muscle during weight loss.

Is losing 5 kg noticeable?

Usually yes, and the change is often more noticeable at a lower starting weight. Five kilos represents around 7% of body weight for someone weighing 70 kg, compared with around 4.5% for someone weighing 110 kg. Where the change is most visible varies from person to person, but you may notice it in how your clothes fit before seeing a significant difference in the mirror. Body composition also matters: losing primarily body fat will generally produce a more visible change than losing the same amount of weight with significant muscle loss.

What to do in the first week

Start with protein. Our coaches focus on including a good source of protein at each meal, then look at portion sizes and drinks, which can contribute significantly to daily calorie intake.

Track your weight consistently rather than focusing on day-to-day changes. Body weight naturally fluctuates with hydration, salt intake and food intake.

A waist measurement can provide another useful measure of progress. If your weight stays stable while your waist circumference decreases, this may indicate positive changes in body composition.

Why the scale can stall even when you are following the plan

Short-term changes on the scale are often influenced by body water, alongside normal day-to-day variation. Your energy requirement also decreases as you lose weight. A study in the International Journal of Obesity measured a decrease of around 101 calories a day in adults who lost around 8 kg over a year. It attributed roughly 60% of that decrease to the loss of energy-expending tissue and roughly 40% to metabolic adaptation. Over one month the effect is small, but it is one reason a calorie deficit that produced results at the start may produce less over time.

We do not recommend responding to a weight loss plateau by immediately cutting calories further. A larger calorie deficit can be harder to sustain and may increase the risk of losing lean mass. Instead, our coaches typically review the plan, maintain adequate protein intake and allow more time before making further adjustments.

When a 5 kg goal may point to an underlying condition

If your weight is not changing despite a consistent plan, it may be worth reviewing both the plan and whether any medical factors could be contributing.

Thyroid disease can affect metabolic rate and make weight management more difficult, but it is treatable once diagnosed. Insulin resistance can also make weight loss more challenging and is often associated with increased waist circumference. Polycystic ovary syndrome (PCOS) affects around one in ten women of reproductive age and can influence weight and metabolism. Certain prescription medications can also contribute to weight gain.

Your endocrinologist will check your thyroid function, your blood sugar and HbA1c, your cholesterol and triglycerides, and your liver and kidney function, alongside a body composition analysis. Identifying an underlying condition does not delay your weight loss plan. It allows your endocrinologist to treat the condition and adjust the plan accordingly.

How Endocare approaches a short-term weight goal

A 5 kg weight loss goal does not automatically mean medication is needed. Weight loss medication is generally considered for patients with a BMI of 30 or above, or 27 or above when weight-related health conditions are present. Your endocrinologist will assess whether medication is appropriate based on your individual health and weight profile. For many patients with a smaller weight loss goal, the focus is on a personalised nutrition and activity plan with regular follow-up.

At Endocare, body composition analysis is included free of charge at every consultation, measuring body fat, visceral fat, skeletal muscle mass and body water. This helps track whether weight loss is coming primarily from fat or lean tissue, something the scale alone cannot show.

If your goal is greater than 5 kg or you are working over a longer timeframe, our articles on how to lose 10 kg in 3 months and how to lose 15 kg in 3 months explain the approach in more detail.

Frequently asked questions

Is losing 5 kg in a month safe?

For most people, yes, provided the calorie deficit is moderate and protein intake is adequate. It is slightly above the 0.5 kg to 1 kg a week the US Centers for Disease Control and Prevention recommends. Speak to a doctor first if you have a medical condition or take regular medication.

Is losing 5 kg noticeable?

Usually, although how noticeable it is depends on your starting weight and body composition. Five kilos represents a larger proportion of total body weight at a lower starting weight, so the visible change may be greater. Losing primarily body fat rather than lean mass can also make a bigger difference to body shape and measurements.

How many calories should I cut to lose 5 kg in a month?

The NHS describes reducing daily calorie intake by around 600 calories as a safe and sustainable approach to weight loss. There is no single number that applies to every person, because it depends on your weight, height, age and activity.

Can you lose 5 kg in a week?

No. A loss of that size in seven days would be mostly water and lean tissue, and it is not something we would recommend. The weight also tends to return once normal eating resumes.

What if I cannot lose 5 kg no matter what I do?

If your weight is not changing despite a consistent plan, we recommend reviewing the plan with your endocrinologist, who can also check whether any medical factors could be contributing. Thyroid disease, insulin resistance, PCOS and certain prescription medications can all make weight loss more difficult.