Eating only 1200 calories a day can lead to weight loss but often causes negative effects like fatigue, nutrient deficiencies, slower metabolism, headaches, and mood changes, and is generally too low for most adults, risking muscle loss and potential health issues unless supervised by a doctor. While it creates a calorie deficit, it's hard to get essential nutrients, making it unsustainable and potentially unhealthy long-term, so focusing on nutrient-dense foods and a more moderate deficit is often recommended.
So eating 1300 is only a 200 calorie deficit. That's going to put you at about 0.5 pound per week loss. Provided you are accurately calculating your intake. And it's not a lot of wiggle room to be inaccurate about your intake.
In order to lose at least a pound a week, try to do at least 30 minutes of physical activity on most days, and reduce your daily calorie intake by at least 500 calories. However, calorie intake should not fall below 1,200 a day in women or 1,500 a day in men, except under the supervision of a health professional.
Consuming at least 1,200 calories per day has often been touted as the minimum for basic bodily functions and to stay out of starvation mode, but the amount is actually too low. A healthy amount of calories for adult women ranges from 1,800 to 2,400 calories per day and for men it's 2,000 to 3,200 calories per day.
Long-Term Survival
Experts agree that consuming fewer than 1,000 calories per day can lead to clinical starvation, where the body begins to shut down and vital functions are impaired.
Feeling anxious, tired, or cold? These could be signs you're not eating enough. Ensure adequate calorie intake for balanced hormones, mood, and overall well-being. Consult a dietitian for personalized advice.
As a general rule though, most nutrition experts recommend never going below 1,000-1,200 calories a day if you're dieting on your own. It's also worth bearing in mind that the body doesn't suddenly 'enter' and 'leave' starvation mode, like crossing the border from Devon into Cornwall.
One cheat day will not lead to weight gain. If you notice an increase in your weight on the scales after a cheat day, it is likely water retention.
The 2-2-2 Method is based on three key components: water intake, nutrient-dense fruit and vegetable intake, and regular exercise. Below, we discuss the purpose of each to highlight how they can help you lose weight and improve your health.
This is called a weight loss plateau and is generally caused by your body becoming used to your new deficit or exercise routine (if you're currently working out) (15). While plateaus are frustrating, they can be overcome with a few changes to your lifestyle or diet.
Get enough B vitamins – B vitamins, in foods such as bananas, baked potatoes, eggs, orange juice, peanut butter, peas, spinach and whole-grain foods, are essential for a fully functioning metabolism. B vitamins help your body metabolize carbohydrates, proteins, and fats, and use the stored energy in food.
The most well-known is ghrelin, the 'hunger hormone', which is mainly secreted by the stomach. If you don't sleep enough, levels of that hormone will be higher, and you will feel hungrier and consume more calories. Over the long term, this leads to weight gain.
Make quality food choices.
Choose nutrient-dense foods to eat (like whole grains, lean proteins and healthy fats) so that you are less hungry between your meals. Make sure you drink plenty of water as well.
You should step on the scale first thing in the morning. That's when you'll get your most accurate weight because your body has had the overnight hours to digest and process whatever you ate and drank the day before.
Here are some of the best ways to get your metabolism back on track.
If you're following a diet for weight loss, you may feel concerned about how overeating might impact your results, but one day of overeating will not negate the progress you've made.
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.
6 Ways To Get Back on Track After a Cheat
What are the signs your body is in starvation mode?
While 1,200 calories may be appropriate for a small number of people with very low energy requirements, for many adults—especially those who are active or have a larger frame—it's simply not enough. Eating too little can slow your metabolism, increase fatigue, and even lead to nutrient deficiencies.
Experts suggest that a person could technically survive on as few as 1,200–1,500 calories per day for a short period, but this can vary greatly depending on the individual's condition, including body fat reserves and hydration levels.
The 3-3-3 rule for weight loss is a straightforward habit-based approach: eat three balanced meals per day, drink three bottles (roughly 1.5–2 L) of water by around mid-afternoon, and engage in three hours of physical activity each week.
People naturally lose muscle after 40, especially women after menopause. Because muscle burns more calories than fat, this can slow down your metabolism and make it harder to shake those stubborn pounds.
“Your heart rate slows, there's less oxygen flow, dizziness, and fatigue.” Undereating can also cause catabolism, or when the body breaks down lean tissue like muscle for fuel, which can lead to loss of muscle mass and muscle wasting. This may be particularly noticeable for athletes experiencing undereating.