Gaining weight on a very low-calorie diet like 800 calories a day could be due to metabolic adaptation, where your body reduces its caloric needs to preserve energy. Other factors like hormonal imbalances, high stress, or insufficient protein intake can also contribute.
Eating 800. calories a day for a week may not cause significant weight gain, but it could still be enough to negatively affect your metabolism. If you then abruptly switch back to eating 1600. calories per day, the excess energy may have an adverse effect on your body, leading to unwanted weight gain or other issues.
A Slower Metabolic Rate
Eating too few calories can cause your metabolic rate to slow down, meaning you may gain weight more easily. Your body requires energy when you walk, work out, think, breathe, just about everything else!
Weight gain on a restricted diet can be caused by underestimating calorie intake, eating the wrong types of foods (like processed foods), or not exercising enough.
If you're experiencing unexplained weight gain despite being in a calorie deficit, it might be helpful to reassess your diet, track your food intake accurately, consider your stress levels and sleep quality, and consult with a healthcare professional to rule out any underlying medical issues.
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.
“Per unit volume, muscle weighs more than fat, so shedding fat and gaining muscle may not immediately change the scale but will result in changes in shape, tone, and measurements,” says McGowan. In other words, you may look leaner as you build muscle and lose fat, but you may actually start to weigh more.
Water retention may clear without treatment in a few days. However, if there is a health problem causing you to hold onto fluid, your swelling may worsen over time. You may find that the body parts retaining water become tight, swollen, and painful. If untreated, heart or kidney problems may get much worse.
Medical reasons
In some cases, underlying medical conditions may contribute to weight gain. These include: an underactive thyroid gland (hypothyroidism) – where your thyroid gland does not produce enough hormones. Cushing's syndrome – a rare disorder that causes the over-production of steroid hormones.
Aim to weigh yourself on the same day, at the same time and in the same environment each week – for example, first thing every Friday morning when you're getting ready to take a shower, after you've gone to the bathroom, but before you've drunk or eaten anything.
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.
In 2 weeks, most people can lose between 2-4 pounds (0.9-1.8kg) if they're sticking to a healthy eating plan and exercising regularly. This might not seem like much, but it's the best way to lose weight without causing harm to your body. Remember that small, steady progress leads to long-term success.
Why does metabolic rate slow down for women? Over time, studies have shown that metabolic rate (how fast we burn calories) starts to slow down by 2 to 3 percent each decade, beginning in our 20s. It becomes more noticeable between ages 40 and 60.
Mostly, losing weight is an internal process. You will first lose hard fat that surrounds your organs like liver, kidneys and then you will start to lose soft fat like waistline and thigh fat. The fat loss from around the organs makes you leaner and stronger.
In general, though, weight loss can be delineated into three stages: rapid weight loss, gradual weight loss, and maintenance. The length of each stage depends on the individual, Michelle Routhenstein, R.D., preventive cardiology dietitian says.
Water weight is not usually a cause for concern, but it can be uncomfortable and recurring. Reducing salt and carbohydrate intake, keeping hydrated, and frequently exercising are all good ways to lose water weight and prevent it from returning.