1200 calories is a figure I come across surprisingly often as an online weight loss coach, particularly when I start working with female clients.
I’ll hear things like, “I’m really weak when it comes to dieting”, “I have no willpower” or “I just can’t stick to my calories”. Then we look at what they’re actually trying to do and discover they’re attempting to live on 1200 calories a day.
In many cases, the problem isn’t a lack of willpower at all. They’re simply really, really hungry because 1200 calories is nowhere near enough food for their body size, lifestyle and activity levels. Yes, losing weight requires a calorie deficit, but that doesn’t mean the biggest calorie deficit you can tolerate for a few days is automatically the best one.
At the same time, I’ve noticed another trend online. Coaches will sometimes automatically slam a 1200-calorie diet as ridiculously low, regardless of who is following it. I suspect part of the reason is that bold statements get clicks, but the reality is more nuanced.
1200 calories is just a number. Whether it’s too low depends on the person.
A 5ft woman weighing 8 stone with a relatively sedentary lifestyle clearly doesn’t have the same energy requirements as a 6ft 3 man weighing 18 stone who trains five times a week. Their calorie requirements could be dramatically different, so applying the same minimum calorie target to everyone doesn’t make much sense.
For context, the NHS uses around 2000 calories for an average woman and 2500 for an average man as general maintenance guidelines, while also making clear that actual energy requirements vary.
So rather than asking whether 1200 calories is universally “good” or “bad”, the much more useful question is: is 1200 calories enough for you?
Is 1200 Calories Enough for a Woman or a Man?
Gender matters when estimating calorie requirements, but it isn’t the only thing that matters.
On average, men require more calories than women. This is partly because men tend to be larger and carry more lean muscle mass, although there is obviously enormous variation between individuals. The NHS’s general calorie figures of approximately 2500 calories for men and 2000 for women illustrate the difference at a population level, but they are averages rather than targets that apply to everyone.
For most men, therefore, 1200 calories is going to represent a very aggressive calorie deficit. A man whose maintenance requirement is 2500 calories would be creating a theoretical deficit of around 1300 calories every single day before accounting for any additional exercise.
For women, things become a little more complicated.
1200 calories could still be unnecessarily low for a taller, heavier or more active woman. If her body requires 2200 calories to maintain its current weight, for example, eating 1200 calories creates a 1000-calorie daily deficit. She might lose weight quickly initially, but she may also be extremely hungry, tired and find the diet increasingly difficult to sustain.
However, take a significantly smaller and lighter woman who doesn’t do much exercise and her maintenance calories could be considerably lower. In that situation, 1200 calories represents a much smaller deficit.
This is why I don’t like arbitrary calorie rules in either direction.
Telling every woman she should eat 1200 calories to lose weight isn’t sensible. But neither is telling every woman that 1200 calories is automatically far too low without knowing anything about her height, weight, age or activity levels.
Your calorie target needs to be based on you, not somebody else’s number.
1200 Calories With Exercise: Where It’s Likely Not Enough
This is where I’d become much more cautious about a 1200-calorie target.
Exercise increases energy expenditure. More importantly, if you’re training regularly, food isn’t simply something you’re trying to restrict to lose weight. It’s also fuel for training and recovery.
Imagine two people who are identical in height, weight, age and sex. One has a sedentary job and does very little structured exercise. The other runs three times a week, goes to the gym twice and regularly walks 10000 steps a day.
It wouldn’t make sense to assume they need exactly the same amount of food.
This is particularly important if you’re combining weight loss with endurance exercise, strength training, HYROX, cycling, running or another demanding form of training. You don’t just want the number on the scales to come down. Ideally, you want to maintain muscle, train effectively, recover properly and have enough energy to function normally outside your workouts too.
Sports science uses the concept of energy availability – essentially, how much dietary energy remains available for normal physiological functions after the energy cost of exercise has been taken into account. Persistently inadequate energy availability can negatively affect both health and sporting performance in men and women.
That doesn’t mean everyone exercising on 1200 calories automatically has low energy availability. Again, context matters. But the combination of low calories and high exercise expenditure should certainly make you question whether the deficit has become unnecessarily aggressive.
Some signs that your calorie target may need reviewing include:
- You’re constantly thinking about food because you’re genuinely hungry.
- Your training performance is deteriorating.
- You’re struggling to recover between sessions.
- Your energy levels are consistently poor.
- You’re finding yourself repeatedly overeating after trying to restrict heavily.
- You’re becoming less active during the rest of the day because you’re exhausted.
- Your diet feels increasingly impossible to maintain.
If you’re trying to lose weight while exercising regularly, the goal shouldn’t be to see how little food you can survive on. It should be to create an appropriate calorie deficit while still supporting your health, training and everyday life.
Who Is 1200 Calories Actually Enough For?
There absolutely are people for whom 1200 calories could create a perfectly reasonable calorie deficit.
This is the part that sometimes gets lost when nutrition is discussed on social media.
Body size has a major influence on energy requirements. Generally speaking, a smaller and lighter person requires less energy than a larger and heavier person. Age and activity also matter, as does body composition.
That means 1200 calories may potentially be appropriate for someone who is relatively short, light and sedentary, particularly where their estimated maintenance calories are already quite low.
There’s also an important distinction between saying “1200 calories could be an appropriate calorie target for this particular person” and saying “women should eat 1200 calories to lose weight.”
The first is individualised. The second isn’t.
I’d also look beyond whether somebody can lose weight on a particular number. I’d want to know how they’re actually getting on with it.
Are they losing weight at an appropriate rate? Are they constantly hungry? Can they eat enough protein and maintain a reasonably balanced diet? Do they have enough energy? Can they stick to it consistently without repeatedly falling off the diet?
If someone is progressing well on 1200 calories, feels good, isn’t excessively hungry and the number is appropriate for their individual energy requirements, I wouldn’t increase their calories simply because somebody on Instagram said nobody should ever eat 1200.
Equally, if someone is white-knuckling their way through every day, constantly hungry and repeatedly overeating because the target is far too aggressive, the fact that an app told them to eat 1200 calories doesn’t make it a good diet.
A calorie target only works if it works for the person following it.
Does Eating Too Little Slow Your Metabolism?
This is another area where the truth tends to get lost between two extremes.
You’ve probably heard people say that eating too little puts your body into “starvation mode” and stops you losing weight altogether. That’s an oversimplification. If you’re genuinely consuming fewer calories than your body uses over time, your body still has to get that missing energy from somewhere.
However, it is also wrong to say that your body does absolutely nothing in response to prolonged calorie restriction and weight loss.
As you lose weight, your calorie requirements naturally decrease because you’re maintaining and moving a smaller body. There can also be additional reductions in energy expenditure beyond those predicted simply by changes in body mass and composition. This is known as adaptive thermogenesis or metabolic adaptation. Research shows that this response exists, although its size varies considerably between individuals.
There’s also a much more practical issue that I see with aggressive diets.
If you’re eating very little, you’re likely to feel more tired. Without consciously realising it, you might move less, sit down more, fidget less and generally reduce your day-to-day activity. Training quality may also fall. At the same time, as you lose weight, the amount of energy required to move your body decreases.
So your total daily energy expenditure can fall as a diet progresses.
None of this means you’ve “broken” your metabolism, and it certainly doesn’t mean eating more calories somehow magically causes greater fat loss.
It means that calorie requirements aren’t static.
Your body weight changes, your activity can change and your energy expenditure can adapt. That’s why a calorie target that produced rapid weight loss at the beginning of a diet won’t necessarily produce exactly the same results several months later.
It’s also another reason why unnecessarily aggressive calorie restriction isn’t automatically better. The goal isn’t simply to create the biggest possible deficit today. It’s to find an approach that allows you to make consistent progress over time.
What to Do If Your Calories Aren’t Working for You
If you’re currently eating 1200 calories and everything is going well, don’t panic because you’ve read online that 1200 calories is automatically too low.
But if you’re constantly hungry, struggling to stick to your diet, overeating regularly, feeling exhausted or finding that your training is suffering, it’s worth checking whether your calorie target actually makes sense.
The first thing I’d do is estimate your individual calorie requirements rather than relying on a generic number. Use my calorie calculator here to get a better idea of how many calories you may need based on factors such as your height, weight, age and activity.
Remember that any calorie calculator is still an estimate. Your real-world progress matters too. Track your weight over several weeks rather than reacting to individual weigh-ins, look at the overall trend and adjust your calories based on what is actually happening.
Most importantly, don’t automatically interpret struggling with a very low-calorie diet as a lack of willpower.
If you’re trying to eat 1200 calories when your body requires substantially more and you’re absolutely ravenous every evening, the answer may not be to become more disciplined. You may simply need a more appropriate calorie target.
Weight loss doesn’t have to mean eating as little as possible. You need a calorie deficit, but ideally you want one that’s large enough to produce progress while still being manageable enough that you can live your life, exercise if you want to and actually stick with it.
If you’re unsure how many calories you should be eating, or you’ve spent years jumping between diets and struggling to find something you can maintain, find out more about my weight loss coaching or get in touch and we can look at an approach that’s built around you rather than an arbitrary calorie number.
