Losing 5 kilos: a realistic timeline instead of a wishful number
The key points at a glance
Five kilograms is a good goal—because it is achievable and because it falls within a range that professional associations consider meaningful. The question is not whether, but over what period.
The evidence-based answer: According to the Federal Center for Nutrition, losing one to two kilograms per month is the appropriate rate. For five kilograms, that works out mathematically to two and a half to five months. This is consistent with the study results reviewed by IQWiG: 3 to 8 kilograms in 6 to 12 months, averaging around 5 to 6 kilograms.
The first week is the most misleading. It often shows the biggest movement on the scale—and says the least about your progress. Why this is the case and when the numbers become meaningful is explained below.
What to expect in this article
1. How quickly is it realistic to lose five kilos?
2. The progression in four phases
3. Why the first week is misleading
4. Three misconceptions about the timeline
5. How to measure correctly
6. What is really happening when your weight loss stalls
7. Comparing two schedules
8. The phase after losing five kilos
9. What matters in the end
Frequently asked questions
Sources
How quickly is it realistic to lose five kilos?
There is unusual clarity on this goal: Although professional associations do not specify a calorie count, they do specify a rate. And that rate is slower than most people plan when they start.
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“Losing weight too quickly is unhealthy, and the weight you achieve that way is difficult to maintain.”
Federal Center for Nutrition (BZfE)
The path to a comfortable weight, as of 2026
The same source specifically cites a weight loss of one to two kilograms per month as the appropriate rate. Divide five kilograms by that rate, and you get a timeframe of two and a half to five months. That is the schedule this article is about.
The Verbraucherzentrale puts it in weekly terms: Depending on their starting weight, people could lose 500 grams to a maximum of 1 kilogram per week. At the upper end of this range, losing five kilograms in five weeks would be possible—but this explicitly applies “depending on starting weight” and describes a case involving a considerably higher starting weight rather than the typical case.
What studies actually show
The most sober benchmark comes from the studies reviewed by IQWiG. Participants in structured weight-loss programs lost between about 3 and 8 kilograms within 6 to 12 months, averaging around 5 to 6 kilograms.
Five kilograms is therefore almost exactly what studies find on average—after six months to a full year, with a program and support. Anyone who sets the same goal for six weeks is not being ambitious, but planning contrary to the available evidence.
The effect of exercise has also been documented: After twelve months, physically active participants had lost nearly two kilograms more than those who changed only their diet. Their activity consisted of 30 to 45 minutes of moderately strenuous exercise 3 to 5 times a week, such as brisk walking.
These two kilograms are a remarkable amount for a five-kilogram goal. They account for a substantial part of the entire effort—and they result from something that requires no dietary change. Brisk walking on four days a week is not a major demand, but it has a measurable effect on the result after twelve months.
At the same time, IQWiG qualifies this: More physical activity alone is generally not enough to achieve sufficient weight loss. Exercise therefore shifts the result in the right direction, but does not replace the balance—for the timeline, this means it can make five months more like two and a half, but it cannot shorten them to six weeks.
The process in four phases
Five kilograms do not disappear evenly. The process follows a typical pattern, and knowing it makes people less likely to doubt themselves at the usual points. The following phases describe this pattern—the time frames are practical estimates for orientation, not figures from studies.
Week 1: the deceptive movement
In the first week, the scales often show the biggest change of the entire effort. A significant part of it is retained water, which is released as carbohydrate stores are depleted—the body stores water together with these stores. None of the sources used here states exactly how large this share is; what is supported is the mechanism, not a percentage. So do not use this week as a benchmark for what follows.
Weeks 2 to 4: the disillusionment
Now the curve flattens out, and many people take this as a failure. In fact, this is where what should be measured only begins. The first meaningful measurement is not available until the end of this phase—four weeks is the minimum needed to see a trend rather than a fluctuation.
Months 2 to 4: the real journey
This is the phase in which most of the five kilograms are lost—at a calculated rate of one to two kilograms per month, two to four of them. It is also the phase in which the least happens that feels like progress: steady, unspectacular, and precisely for that reason sustainable.
From month 5 onward: maintaining instead of continuing
Once the goal has been reached, the part begins that the IQWiG describes as more difficult: Keeping the weight off permanently after losing it is usually harder than losing the weight itself. Intake now increases again—to meet the somewhat lower requirement that exists by then, not the one from five months earlier.
What stands out about this progression is that the two phases with the highest risk of dropping out follow one another directly. Phase 1 creates an expectation that Phase 2 disappoints—and anyone who gives up in Phase 2 sees nothing of the actual journey in Phase 3.
If you take away just one thing from this timeline, let it be this: Factor in the disappointment in week 2. It does not happen because something went wrong, but because week 1 showed something that cannot be repeated. Knowing this in advance changes how you interpret the scale in week 2.
It is also useful to deliberately place your own checkpoint at the end of Phase 2 rather than in the middle. Four weeks is not an arbitrary interval, but the point at which a trend can be distinguished from a fluctuation.
Why the first week is misleading
The body stores carbohydrates in limited quantities, and it stores them together with water. When intake is reduced, it first draws on these stores—and the water bound to them goes with it. On the scale, this looks like rapid success.
At this point, this article deliberately remains imprecise: None of the sources used here states how large the water component of the weight loss in the first week is. Percentages are circulating online, but without institutional evidence—and adopting a figure that no one stands behind would be the wrong approach in an article about realistic expectations.
What you can take away from this is still concrete. The figure from week 1 is not suitable for extrapolation. Anyone who loses two kilograms in the first week and extrapolates that to ten kilograms in five weeks is calculating with an effect that will not repeat.
The same applies in the opposite direction when you start eating normally again: Your stores refill, the water returns, and the scale rises by one or two kilograms. This is not fat gain either—it is the same mechanism in reverse.
What this means for your expectations
In practical terms, this means: Of your five kilograms, the first one or two are not the same as the last three. Anyone who considers their goal achieved as soon as the scale shows the number may have only borrowed part of that loss—it will return as soon as they start eating normally again.
This is one reason why very short timelines end so unsatisfactorily. Losing five kilograms in four weeks consists to a considerable extent of an effect that disappears again once normal eating resumes. Losing five kilograms in four months does not—the water effect from week 1 is too small relative to the overall result to make a meaningful difference.
In practice, this leads to a simple rule: Evaluate your result no earlier than four weeks after starting, and never the day after you have eaten normally again. Both are points at which the scale shows something different from what you want to know.
In brief
For five kilograms, a period of two and a half to five months is realistic—derived from the Bundeszentrum für Ernährung’s statement that losing one to two kilograms per month is the appropriate rate. In the studies cited by the IQWiG, participants lost an average of about 5 to 6 kilograms over 6 to 12 months. The first week usually shows the greatest movement on the scale because water bound to depleted carbohydrate stores is released; it therefore cannot be used to project the following weeks.
Three misconceptions about the timeline
Around a specific weight-loss goal, assumptions persist that systematically distort the timeline. Three of them are worth correcting.
How to measure correctly
A timeline spanning several months requires a measurement that reflects that period. The daily scale does not do this—it mainly shows fluctuations unrelated to progress.
That is why a fixed routine under the same conditions makes sense: the same day of the week, at the same time, before breakfast, and after using the toilet. What you compare then is not the individual reading, but the trend over four weeks.
Daily fluctuations of one to two kilograms are normal. They are caused by fluid levels, salt intake, and digestion, and say nothing about fat mass. Anyone who weighs themselves daily and interprets every change will mainly end up frustrated—and make decisions based on noise.
It is also useful not to record only your weight. A date, your starting weight, and a brief note about the week turn a series of numbers into information that can be useful later—especially when progress temporarily stalls.
It is also worth using a second measure alongside your weight. The way a particular pair of trousers fits or how a familiar walking route feels can change earlier than the number on the scale—and neither fluctuates with the salt content of the previous evening’s meal.
What Is Really Happening When Your Weight Stalls
At some point, the number on the scale stops moving, and that is where most efforts end. Yet there are several explanations for this, none of which have anything to do with a lack of discipline.
The first comes from IQWiG: Weight loss also leads to a reduction in muscle mass. As a result, the body needs less energy, meaning fewer calories. The more weight you lose, the more difficult it becomes to maintain the weight you have reached or lose even more. Resting energy expenditure depends primarily on the proportion of muscle mass in your body weight and accounts, on average, for around 70 percent of total calorie needs.
In practical terms, this means that the reduction you set at the beginning has become something different after three months—not because you are behaving differently, but because your needs have shifted. You can find a detailed explanation of how to deal with this in our article How to Calculate a Calorie Deficit for Weight Loss Correctly.
The second explanation is more mundane and more common: estimation errors on the intake side. Portion sizes are estimated, cooking oil is forgotten, and drinks are not counted. Over several weeks, this can add up to an amount large enough to offset a moderate reduction.
And the third: The observation period was too short. Two weeks without movement fall within the normal range of fluctuation. Only when nothing changes over six to eight weeks is it a signal—and then the answer is not a larger deficit, but a review of the calculations.
The order of these three checks is important. First, the time frame, because it is most often too short. Then the intake, because that is where most errors hide. Only last, the calculations themselves, because adjusting them only makes sense if the first two points are correct.
What is explicitly missing from this list is the explanation “not enough discipline.” It explains nothing and leads to the response that most often causes harm – eating even less. A plateau is information about the calculations, not a judgment about the person.
And one more point, which rarely applies to a five-kilo goal but should be mentioned: Anyone who makes no progress for months even though the calculations are sound should raise the issue with their family doctor. Not every cause can be explained by a number.
Comparing two schedules
The same goal, two time frames. The following comparison shows what changes as a result – and what does not.
| Criterion | 5 kg in 2.5 to 5 months | 5 kg in 4 to 6 weeks |
|---|---|---|
| Compared with the recommendation | Corresponds to the BZfE's 1 to 2 kg per month | Is above that level; only at the upper end of the Verbraucherzentrale range and only with a correspondingly high starting weight |
| Required calorie intake | A moderate reduction, generally well above the lower limit | Can result in less than 1,200 or 1,500 kcal with low energy requirements – medical supervision is then necessary |
| Share from week 1 | Has little impact over the overall period | Accounts for a substantial part of the result – and returns when normal eating resumes |
| Change in eating habits | Takes place incidentally because the period is long enough | Usually does not take place – according to the DGE, the typical trigger of the yo-yo effect |
| Is meaningful monitoring possible? | Yes – several four-week sections over the course of the period | Hardly – the period allows for at most one section |
Information based on the German Federal Centre for Nutrition (BZfE), the Verbraucherzentrale, the Institute for Quality and Efficiency in Health Care (IQWiG), and the German Nutrition Society (DGE). The column headings are editorial calculation examples, not categories used by the institutions named.
The phase after losing five kilos
The schedule does not end when the goal is reached; instead, it transitions there into another phase. The DGE describes this transition as the critical point: After dieting, people regain weight just as quickly, sometimes even more than they lost, as soon as they fall back into old eating habits.
The consumer advice center derives a structure from this that can also be adopted without a program: a weight-loss phase, a transition phase, and a follow-up phase. In other words, the weeks after reaching the goal should be planned just as carefully as the weeks before.
In practice, little is needed for this. After losing five kilograms, your needs are slightly lower than before, so intake should not return to the old level but adjust to the new one. Monitoring also continues—a weigh-in once a month is enough, but it should remain on the calendar.
The German Nutrition Society (DGE) sums up the underlying principle in one sentence: Frequent fluctuations in weight disrupt metabolism, hormones, and mental health, so gradual weight loss in stages is healthier and more likely to succeed in the long term. Five kilograms that stay off are worth more than eight that come back.
Before a product is mentioned here
One clear statement up front: No DNA test predicts weight-loss success, and none shortens the period described here. Losing five kilograms takes two and a half to five months, with or without an analysis. Anyone promising otherwise is promising too much.
What a genetic analysis can describe is beside the point here—namely, predispositions in areas such as responses to fats and carbohydrates. This information helps answer what you fill the weeks with, not how many weeks there will be.
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Makes sense for you if …
… you have already tried several diets and want to know why one of them felt easier.
… you are already planning over several months and can incorporate the evaluation into phase 3 of the schedule.
… you prefer a one-time analysis to an ongoing subscription—the gene variants will not change.
Probably not if …
… you want to reach your goal faster: The test does not shorten the schedule or predict success.
… you want to get started in the short term: The evaluation takes several weeks, during which you will be getting started anyway.
… the basic calculation has not yet been done: Without your energy needs and calorie deficit, information about your genetic predisposition is of little use.
What matters in the end
Five kilograms is not an ambitious goal—it is almost exactly what studies find on average. The ambitious part is the timeframe you set for achieving it.
Two and a half to five months sounds like a long time until you compare it with the alternative: a faster approach that the Federal Centre for Nutrition says is unhealthy and whose results are difficult to maintain. The longer schedule is not the more cautious one; it is the one that more often leads to the goal in the end.
Your specific next step: Put a date four weeks from now in your calendar, and note your weight and start date today. Ignore everything in between, including the encouraging number from week 1. What the scale shows on the check-in day is the first information you can actually use.
And if you weigh one kilogram on that day instead of the three you were hoping for, then you are exactly on track. One kilogram per month is the lower end of what the Federal Centre for Nutrition calls the right amount—and the safest way to lose five kilograms that will still be gone next year.
Frequently asked questions
How long does it take to lose 5 kilos?
Two and a half to five months is realistic. This is based on the Federal Centre for Nutrition's recommendation that losing one to two kilograms per month is the right amount (2026). In the studies reviewed by IQWiG, participants in structured weight-loss programmes lost an average of around 5 to 6 kilograms over 6 to 12 months.
Can I lose 5 kilos in one month?
That is above what professional societies consider sensible. The Federal Centre for Nutrition recommends one to two kilograms per month, while the consumer advice centre recommends 500 grams to a maximum of one kilogram per week, depending on starting weight. Those who proceed faster often fall below the calorie minimum of 1,200 or 1,500 kilocalories, below which, according to the consumer advice centre, medical supervision is necessary.
Why am I losing so much in the first week?
The body stores carbohydrates together with water. When these stores are depleted, the bound water goes with them—on the scale, this looks like rapid success. None of the sources used here states exactly how large this share is; what is documented is the mechanism, not a percentage. Week 1 therefore cannot be used to project the following weeks.
What should I do if the scale stops moving?
First, check the timeframe: Two weeks fall within the normal fluctuation range. If nothing changes for six to eight weeks, there are two possible explanations. First, the calculation: According to IQWiG, muscle mass decreases along with body weight, so the body needs less energy. Second, errors in estimating intake. In both cases, the answer is to review the situation, not create a larger deficit.
How often should I weigh myself?
Once a week under the same conditions is sufficient—the same day of the week, at the same time, before breakfast. It is not the individual reading that matters, but the trend over four weeks. Daily fluctuations of one to two kilograms caused by fluid, salt, and digestion are normal and say nothing about fat mass.
The schedule is set—what will you fill it with?
The weeks are set and cannot be shortened. What you can influence is what you fill them with—and how your body responds to fats, carbohydrates, and exercise.
View WeightLoss SLIM Calculate your calorie needs firstYou might also be interested in
→ Lose weight healthily instead of quickly: what really works
A look at how to do it once the timeframe has been established.
→ How to calculate a calorie deficit for weight loss correctly: where the limits lie
The size of the calorie deficit and the lower limit associated with this schedule.
Sources
- Federal Centre for Nutrition (BZfE): The path to a comfortable weight, as of 2026 — bzfe.de
- Institute for Quality and Efficiency in Health Care (IQWiG): Weight-loss programs and medications, as well as Causes of obesity, as of 2022 — gesundheitsinformation.de
- Consumer Advice Centre: Crash diets, as of 2022, and Weight-loss programs – what to consider when choosing, as of 2025 — verbraucherzentrale.de
- German Nutrition Society (DGE): Diets and fasting, as well as “I am losing weight” — dge.de
The figure of one to two kilograms per month and the quotation about losing weight too quickly come from source [1]. The study results of 3 to 8, or an average of 5 to 6, kilograms over 6 to 12 months; the exercise effect of just under two kilograms, along with the amount of activity; the statements about muscle mass and resting metabolic rate; and the finding that maintaining weight is harder than losing it come from source [2]. The range of 500 grams to 1 kilogram per week, the lower limits of 1,200 and 1,500 kilocalories, respectively, and the division into weight-loss, transition, and follow-up phases come from source [3]. The description of the yo-yo effect when reverting to old habits comes from source [4]. The timeline in Chapter 2 and the information on the measurement schedule in Chapter 5 are editorial classifications and are identified as such in the text. None of the four sources gives a figure for the proportion of water and carbohydrate stores in the weight lost during the first week; the article therefore deliberately does not provide one. Product information comes from the mybody®x product pages, accessed on August 5, 2026.
mybody®x Editorial & Expert Team
Energy metabolism Nutritional science Nutrigenetics
This article was created and medically reviewed by the mybody®x Editorial and Expert Team. The team combines expertise in nutrigenetics, microbiome and gut science, blood analysis interpretation, nutritional science, and laboratory diagnostics.
Published on August 5, 2026 · Last updated on August 5, 2026
Medical notice: This article is intended for general information and does not replace medical advice, diagnosis, or treatment. Energy intake below the stated limits should be medically supervised. Weight loss should be medically supervised in cases of existing medical conditions, during pregnancy and breastfeeding, in older age, and in people with a history of eating disorders.
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