Why do I gain weight when I eat 1200 calories (2024)

It's a common question among women who are trying to lose weight: why do I gain weight when I eat 1200 calories? The answer, unfortunately, is not always simple. There are a number of factors which maybe masking weight loss, even when eating a relatively small amount of calories. Here's a look at some of the most common reasons why you might be seeing the scale go up instead of down.

1. You may be eating more than you think - keep track of everything you eat and drink in a day

When it comes to tracking what we're putting into our bodies, research shows us how it's so easy to underestimate just how much we're eating and drinking in a day. To truly understand where your nutritional intake is coming from, tracking correctly is one of the most powerful tools to understand how much you're currently eating and to make better dietary decisions. Keeping track of everything we eat and drink can help us stay on top of our diet, improve our overall health and create accountability for the nutritional choices that we make each day. This only needs to be a temporary measure, tracking should not be something you do forever, but be used to help you become more intuitive with your eating.

2. Scale weight is masking fat loss

It is important to recognise this disconnect between scale weight and actual fat loss when planning a weight loss programme. Scale fluctuates can come from many things other than fat loss such as fluid changes, menstrual cycle, sodium and carbohydrate intake. So it is important to recognise that the scale will fluctuate throughout the week even though you're still using fat. This is why at Box Nutrition we look at trend lines over the week/month to understand if fat loss is really occurring.

3. You're not being patient enough to see your weight loss goals

It can be discouraging when we don't see results as quickly as we would like, or if you hit a plateau. However, patience is key when it comes to weight loss. It can be easy to chase quick fixes and be hard on ourselves for not seeing the desired results. To help overcome this is it is important to set yourselves realistic weight loss targets.

As a rule of thumb, you should sim to lose 0.5-1% of your bodyweight each week, however, this will depend on your starting weight and composition. At Box, we aim for between 5-10lbs per month of weight loss with Ignite. You will lose weight more quickly than this with FAD diets, however you're it's almost certain to put the weight back on.

Why do I gain weight when I eat 1200 calories (2)

With Ignite, we aim for 0.5-1% of weight loss per week which might not be as quick as a FAD diet in the short term, however it leads to sustainable long term change.

4. You're not losing weight because you're eating back the calories from exercise

Eating back the calories you've burned through exercise can put a serious damper on your weight-loss efforts. Studies (1) have shown that people got to the gym can often overestimate the calories they have burned by up to 70%. Other studies (2) Unsurprisingly, research has demonstrated that people consume more calories than they expend because their brains send them the message that they "deserve" it. Even when you track your workouts, research (3) has shown trackers can be off by up to 40%, which is a lot!

6. You're not losing weight on 1200 calories because of metabolic adaptation

Many people struggle to lose weight even when they maintain a consistent 1200 calorie diet. The reason why this may be happening is due to metabolic adaptation. This is a term used to describe the bodies natural tendency to decrease its metabolism Rate of Metabolism (RMR) in response to caloric restriction, leading to slower fat loss than expected. In addition, as metabolism slows, each calorie consumed yields less energy, resulting in inadequate sustenance for an individual’s body composition and health needs. To combat metabolic adaptation and achieve effective weight loss, it is important for individuals to increase activity levels and cycle calories appropriately.

Why do I gain weight when I eat 1200 calories (3)

7. You might be struggling to lose weight on 1200 calories because your metabolism is slow

Losing weight can be a difficult task, especially if your metabolism is running slow. It's possible that with only a 1200 calorie diet, it might not be enough to shed off those extra pounds due to metabolism costs. Metabolism costs are when your body uses more energy than you consume in food, meaning your metabolism speed has decreased. To understand if you have a slow metabolism then the only way to know is through a Resting Metabolic Rate (RMR) test.

Summary

If you're not losing weight despite following a 1200 calorie diet, it could be for any number of reasons. You might be underestimating how many calories you consume, the scale might be masking fat loss or you could be eating the calories you burn from exercise. It's also important to consider that weight loss takes time and patience - if you give up too soon, you'll never see results. If all this sounds familiar then get in touch at info@boxnutrition.co.uk , so we can help identify where you might be going wrong and offer some solutions.

Why do I gain weight when I eat 1200 calories (2024)

FAQs

Why do I gain weight when I eat 1200 calories? ›

The reason why this may be happening is due to metabolic adaptation. This is a term used to describe the bodies natural tendency to decrease its metabolism Rate of Metabolism (RMR) in response to caloric restriction, leading to slower fat loss than expected.

Why am I gaining weight even though I am in a calorie deficit? ›

Your body composition may be another reason why you are still gaining weight while in a calorie deficit. If you have a higher body fat percentage and lower muscle mass, then you are probably burning fewer calories than if you had more muscle mass.

How long will it take to lose 30 pounds on a 1200 calorie diet? ›

For example, it would take one 3 to 6 months on average to lose 30 pounds on a 1200 calorie diet. It is based on CDC; one can lose 1 to 2 pounds per week on average.

Why am I gaining weight when I only eat 1000 calories a day? ›

However, other studies show that while consuming 1,000 calories a day may result in significant weight loss, most people cannot sustain it and often experience significant weight regain . The reasons include regaining lost muscle mass and increased appetite. Also worth noting is that the human body can adapt.

Why is my weight not going down in a calorie deficit? ›

Certain medical conditions and medications can interfere with weight loss efforts. Conditions such as hypothyroidism, polycystic ovary syndrome (PCOS), and insulin resistance can make it more challenging to lose weight despite being in a calorie deficit.

Why am I gaining weight but eating less? ›

If you're asking yourself, “Why am I gaining weight when I barely eat,” several factors may be at play. Your body may be holding onto fat stores if your eating habits are inconsistent or restricted. Or, your weight gain may be the effect of a sedentary lifestyle, medical condition, or long-term stress.

How do you restart your metabolism? ›

How to Reset your Metabolism
  1. Increase water intake.
  2. Get enough sleep.
  3. Calculate enough calories for energy expenditure.
  4. Increase protein intake.
  5. Spice up your life.
  6. Drink coffee.
  7. Build muscle mass.
  8. Boost your physical activity.

How do I speed up my metabolism? ›

Some things that may boost metabolism include:
  1. Exercising more.
  2. Eating less fat and more complex carbs.
  3. Planning your meals.
  4. Eating at regular times.
  5. Limiting alcohol and sugar.
  6. Getting enough sleep.
Mar 5, 2024

How long will it take to lose 15 pounds on a 1200 calorie diet? ›

After 1 year, those eating 1,200–1,500 calories per day experienced an average weight loss of 15 pounds (6.8 kilograms). However, 23% of the 4,588 people following the 1,200-calorie diet dropped out of the study ( 7 ).

How many calories should I eat to lose 2 lb a week? ›

How many calories should I eat to lose weight? If you need to lose weight generally, a reduction of 500-600kcals per day will help you to achieve a 1-2lb/0.5-1kg weight loss per week.

Why am I gaining weight eating 1200 calories? ›

The reason why this may be happening is due to metabolic adaptation. This is a term used to describe the bodies natural tendency to decrease its metabolism Rate of Metabolism (RMR) in response to caloric restriction, leading to slower fat loss than expected.

Why am I gaining weight on a very low calorie diet? ›

You Might Be Eating Too Little

This phenomenon is called “starvation mode,” and while your body isn't actually starving, it will naturally hold onto whatever calories it receives in an effort to help you maintain your energy balance.

What causes rapid weight gain in females? ›

Bloating, or swelling due to a buildup of fluid in the tissues can cause weight gain. This may be due to menstruation, heart or kidney failure, preeclampsia, or medicines you take. A rapid weight gain may be a sign of dangerous fluid retention. If you quit smoking, you might gain weight.

Why am I not losing weight on a 1200 calorie diet? ›

So, if you're eating 1,200 calories and not losing weight, it could be that your body is really struggling to function on so little fuel and your metabolism is not functioning well enough to respond to a deficit in the way you'd like.

Can eating too few calories cause weight gain? ›

One of the primary reasons that undereating can lead to weight gain is because consuming too few calories can cause your resting metabolic rate to slow down. This means you may burn fewer calories throughout the day.

Why do I look fatter even though I'm in a calorie deficit? ›

A lack of exercise may make you lose weight but look fatter because if you restrict your caloric intake and don't work your muscles, you will start losing muscle mass. In such a case, the result on your scale will show you not only how much fat you have burned, but also how much muscle mass you have lost.

Why am I not gaining weight but eating enough calories? ›

Some studies suggest that some people are genetically influenced to move their body more than others, which helps them to burn a considerable amount of calories and maintain a healthy weight. Besides, some people burn more calories by performing the same exercise than others. This entirely depends on their genetics.

Why am I gaining weight while counting calories? ›

Calorie counting can cause long-term weight gain

You'd have less muscle, which means your basal metabolic rate is lower. This means that instead of needing (for example) 1850 calories, your body would require far fewer, making it even harder to lose weight.

How do I not gain weight on a calorie deficit? ›

To reverse diet without gaining weight, slowly increase your calorie intake to a higher target calorie goal. By doing this in a strategic, slow manner, you may be able to boost your metabolism, manage your hunger levels, and prevent or reduce rapid weight regain.

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