How long does it take to lose 10 kg? Explaining a safe pace for weight loss
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"I want to lose 10 kg" – with such a specific goal, it's natural to want a realistic timeline of how long it will take. You might feel rushed by social media posts claiming "10 kg lost in 1 month," but such drastic weight loss often far exceeds medically recommended paces. This page provides a detailed explanation of safe weight loss paces, a realistic timeframe for losing 10 kg, and the factors that influence this duration.
Medically Recommended Weight Loss Pace
Generally, a healthy weight loss pace is considered to be within 5% of your body weight per month. This guideline accounts for the body's natural adjustment not just of fat, but also muscle and water. Exceeding this pace with rapid weight loss can place excessive strain on the body and increase the risk of rebound weight gain.
| Current Weight | Estimated Safe Monthly Weight Loss Range |
|---|---|
| 50kg | Up to 2.5kg |
| 60kg | Up to 3kg |
| 70kg | Up to 3.5kg |
| 80kg | Up to 4kg |
| 90kg | Up to 4.5kg |
Individuals with higher starting weights tend to experience larger initial weight loss. This is because larger body sizes generally have higher basal metabolic rates and daily energy expenditure, making it easier to achieve an energy deficit even with the same diet and exercise.
Estimated Time to Lose 10 kg
| Pace | Estimated Duration | Characteristics |
|---|---|---|
| 1kg per month (Slow & Steady) | Approx. 10 months | For those prioritizing lifestyle changes and minimizing rebound risk. |
| 2kg per month (Reasonable) | Approx. 5 months | For those focusing on dietary management and aiming for a standard pace. |
| 3kg per month (With Medical Support) | Approx. 3-4 months | For those using GLP-1 medications, aiming for a more planned approach. |
When medical weight loss treatments such as GLP-1 medications (e.g., Mounjaro, Ozempic) are used, appetite naturally becomes more manageable, making progress more predictable compared to relying solely on self-managed dietary restrictions. However, the principle of avoiding rapid weight loss still applies.
Why "10 kg in 1 Month" Is Dangerous
Attempting to lose weight at a pace significantly exceeding 5% of body weight per month (e.g., 10 kg for a 60 kg individual) often leads to weight loss primarily through extreme dietary restrictions and dehydration. In such cases, what's lost is not just fat, but largely muscle and body water. This typically doesn't result in noticeable physical changes and can lead to a vicious cycle of decreased basal metabolism, making future weight regain (rebound) more likely.
| Weight Loss Breakdown | Gradual Weight Loss (2-3 kg/month) | Rapid Weight Loss (5+ kg/month) |
|---|---|---|
| Fat loss ratio | Relatively high | Relatively low |
| Muscle loss ratio | Low | Tends to be high |
| Rebound likelihood | Relatively low | High |
| Effect on skin/hair | Minimal | Common due to nutritional deficiencies |
Factors Influencing the Duration
① Starting Weight and Body Fat Percentage
Individuals with higher starting weights tend to experience greater initial weight loss, but the pace of loss tends to slow down as they approach a healthy weight. This is a natural adaptive response (adaptive thermogenesis) where the body tries to conserve energy, sensing that further loss could compromise vital functions.
② Whether Medical Weight Loss Is Used
Combining treatments like GLP-1 receptor agonists or SGLT2 inhibitors can make progress more predictable than relying solely on self-managed dietary restrictions, as they either naturally curb appetite or help excrete some ingested calories/sugars from the body.
③ Presence of Exercise Habits
Incorporating strength training helps maintain muscle mass while reducing fat, preventing a drop in basal metabolism. Aerobic exercise directly increases calorie expenditure. Combining both can lead to more efficient weight loss.
④ Lifestyle (Sleep & Stress)
Lack of sleep and stress are known to increase the secretion of appetite-stimulating hormones (ghrelin) and weaken the action of satiety-related hormones (leptin). To maintain a steady weight loss pace, it's essential to review your overall lifestyle, not just diet and exercise.
Medical Weight Loss Options Available at Our Clinic
For those who wish to shorten the duration or proceed more methodically, medical support options are available. Our clinic offers several choices with different mechanisms of action, which can be combined according to your body type and preferences.
GLP-1 Medications (Naturally Suppress Appetite)
These medications work on the brain's satiety center to naturally reduce food intake. You can choose between once-weekly injections or daily oral tablets.
| Medication | Features |
|---|---|
| Mounjaro | Acts on both GIP and GLP-1. High weight loss efficacy expected with once-weekly administration. |
| Ozempic | Once-weekly GLP-1 medication with a long track record. |
| Rybelsus | Oral tablet option for those who dislike injections. |
| Founyo | New oral type that can be taken regardless of meal timing (not yet approved in Japan, scheduled for release). |
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Metformin (Supports Glucose Metabolism)
This medication has a proven track record in treating type 2 diabetes worldwide and has been reported to have a mild weight-reducing effect. It is chosen by those who want to combine it with GLP-1 medications or prefer starting with a less burdensome method.
SGLT2 Inhibitors (Excrete Sugar through Urine)
Rather than suppressing appetite, these medications support weight loss by excreting excess sugar from the body along with urine. Because their mechanism of action differs from GLP-1 medications, combining them is believed to offer greater efficacy.
Xenical (Cuts Fat Absorption)
This medication supports weight management by inhibiting about 30% of dietary fat absorption and excreting it from the body. Unlike GLP-1 medications or SGLT2 inhibitors, it doesn't suppress appetite but rather prevents fat absorption, making it a good choice for those who frequently dine out or consume fatty foods.
Herbal Medicine (Adjusts according to body type)
For those with robust constitutions prone to constipation, Bofutsushosan might be suitable. For those with fair skin who are plump and prone to swelling (known as "water weight" in traditional medicine), Boiogito is an option. Choices are made according to your body type (sho).
If you're unsure which method is right for you, we offer online consultations where a doctor will discuss your symptoms, body type, and preferences, and then propose a suitable plan, including potential combinations of treatments.
Risks of Rapid Weight Loss
- Decreased basal metabolism due to muscle loss – making it harder to lose weight and easier to regain it.
- Poor physical condition due to nutrient deficiencies – dizziness, fatigue, decreased concentration.
- Increased likelihood of rebound – weight lost rapidly tends to be regained rapidly.
- Worsening skin and hair condition – often affected by protein, vitamin, and mineral deficiencies.
- In women, it can lead to menstrual irregularities.
Coping with a Weight Loss Plateau
During weight loss, you may reach a "plateau" where your weight stops decreasing, even if it was previously going down steadily. This is a natural response where your body adapts to its current weight, and it's usually temporary. During a plateau, trying to further restrict your diet can actually lower your basal metabolism and lead to rebound. It's recommended to maintain your current pace for a few weeks and observe.
Frequently Asked Questions
This pace far exceeds the medically recommended range (within 5% of body weight per month) and places a significant burden on the body, so it is not recommended. We advise planning for a safe weight loss pace.
While GLP-1 medications can make weight loss easier by naturally suppressing appetite without extreme self-restraint, rapid weight loss is still not recommended. We suggest aiming for a planned pace of about 3 kg per month.
Avoiding rapid weight loss and building a foundation of healthy habits (sleep, balanced diet, exercise) helps prevent rebound. It's also good to plan for the "maintenance phase" after reaching your target weight.
It's usually temporary. Instead of trying to restrict your diet further out of frustration, we recommend maintaining your current pace for a few weeks and observing. If there's no improvement, you can consult with a doctor to review your approach.
Weight loss is possible through diet management alone, but combining it with exercise makes it easier to efficiently lose fat while maintaining muscle mass. Especially when medical weight loss treatments are combined with exercise, a more stable pace of weight loss can be expected.
