Losing weight too quickly can lead to problems like gallstones, muscle loss, and extreme fatigue. Experts recommend a moderate weight loss of 1–3 pounds (0.45–1.36 kg) per week, or about 1% of your body weight.
The point at which unexplained weight loss becomes a medical concern is not exact. But many health care providers agree that a medical evaluation is called for if you lose more than 5% of your weight in 6 to 12 months, especially if you're an older adult.
Hyperthyroidism, or overactive thyroid, develops when your thyroid gland makes too much thyroid hormone. These hormones control many functions in the body, including metabolism. If your thyroid is overactive, you'll quickly burn calories even if you have a good appetite. The result can be unintentional weight loss.
Extreme weight-loss is defined as a loss of more than 1kg a week for a sustained period. Under such circumstances, your body is unlikely to be able to keep up and noticeable symptoms are bound to appear. Some may seem harmless on the surface, like minor hair-loss or feeling cold more frequently.
Unplanned weight loss is a red flag for health and, in cases of significant unplanned weight loss (more than 3kg over three months), the cause needs to be explored further.
According to the American Cancer Society, significant weight loss happens most often with cancers that affect the stomach, pancreas, esophagus and lung.
The National Library of Medicine defines rapid weight loss as losing more than two pounds per week for several weeks. Typically, rapid weight loss occurs from greatly reducing your calorie intake.
Your blood pressure can drop if you also lose weight too quickly, which can be dangerous. Dehydration and electrolyte imbalance can also occur. Other side effects of quick weight loss include dizziness, constipation, hair loss, headaches, irritability, fatigue, and muscle loss.
In anorexia, death from organ failure or myocardial infarction is fairly common (up to 20 percent of cases end this way) and tends to happen when body weight has fallen to between 60 and 80 pounds (although it can occur at any time).
Your clothes are looser – This is often one of the first things you'll notice when you're trying to start losing weight. Once you've gotten past the first few weeks and your body has flushed out bloat and started burning excess fat, your clothes won't feel as tight.
Body-weight loss is usually noticed around the belly, waistline, and thighs first. This is because your body stores fat in different locations. For instance, men hold more fat around their belly, while women store it on their thighs and hips. Weight loss gradually starts with a reduction in belly size.
Causes of unintentional weight loss
It might be caused by a stressful event like a divorce, losing a job, or the death of a loved one. It can also be caused by malnutrition, a health condition or a combination of things.
Involuntary weight loss generally develops over weeks or months. It can be a sign of a significant physical or mental disorder and is associated with an increased risk for mortality. The causative disorder may be obvious (eg, chronic diarrhea due to a malabsorption syndrome.
If you're losing weight without trying and you're concerned about it, consult your health care provider. As a rule of thumb, losing more than 5% of your weight over 6 to 12 months may indicate a problem.
Blue Color Facts
Of all the colors in the spectrum, blue is an appetite suppressant. Weight loss plans suggest putting your food on a blue plate. Or even better than that, put a blue light in your refrigerator and watch your munchies disappear.
Losing weight too quickly can damage your metabolism
If you lose more than about 8 pounds in a month, not only will you likely not be able to keep it off, but it also means you probably engaged in unhealthy behaviors to get there.
The brain and nerve cells require a constant supply of oxygen and will die within a few minutes, once you stop breathing. The next to go will be the heart, followed by the liver, then the kidneys and pancreas, which can last for about an hour. Skin, tendons, heart valves and corneas will still be alive after a day.
"These results show that the lungs are the primary excretory organ for weight loss. The water formed may be excreted in the urine, feces, sweat, breath, tears or other bodily fluids, and is readily replenished," the researchers said.
Researchers found the association between weight gain and mortality weakens as you get older, and losing weight in middle age or late adulthood may heighten the risk of premature death, particularly when it comes to heart disease.
Long periods of weight loss can lead to malnutrition. Malnutrition occurs when you aren't consuming a proper amount of nutrients. This can be especially true for those with a digestive disorder such as celiac disease, which affects how the body absorbs nutrients.
No, it is not safe. A month is not enough time to lose so much weight. 20 pounds in a month is a drastic weight loss that can lead to health issues. The healthy amount of weight loss in a month is between 4-8 pounds a month.