Rapid weight loss diet is a type of diet in which you lose more than 2 pounds (1 kilogram, kg) a week over several weeks.
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.
When you're trying to lose weight, it's natural to want it to happen very quickly. But people with gradual and steady weight loss (about 1 to 2 pounds per week) are more likely to keep the weight off.
Rapid weight loss usually occurs from extreme calorie deprivation, for example, people who go from eating 3,000 to 1,200 calories a day, says Gans. Trouble is, our body recognizes this as a sign of limited food supply and goes into starvation mode.
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.
According to the American Cancer Society, significant weight loss happens most often with cancers that affect the stomach, pancreas, esophagus and lung.
Stage 1 — Rapid weight loss
It usually happens within the first 4–6 weeks ( 1 ). Most of the weight loss in this stage comes from carb stores, protein, and water — and to a lesser extent, body fat.
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. For example, a 5% weight loss in someone who is 160 pounds (72 kilograms) is 8 pounds (3.6 kilograms).
Unintentional weight loss has many different causes. 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.
Although there are more than 200 different cancer types and various potential warning signs for each – there is one symptom that is shared by many different types. Sudden and unexplained weight loss may be a warning sign of cancer, and is often one of the very first signs of the disease.
Rapid and drastic weight loss can lead to various complications. It includes mainly muscle loss, metabolic changes and nutrient deficiencies. In addition, dehydration, electrolyte imbalance, fatigue gallstone formation are other side effects.
What's more, the stress hormones that our bodies release can speed up our metabolism, causing us to burn calories faster. In more extreme cases, prolonged stress may lead to depression, which can also cause weight loss.
On average, it's not uncommon to lose 10 to 15 percent of your overall body weight due to anxiety and the chronic stress it causes. Always talk with your doctor if you've lost a lot of weight in a hurry.
Weight loss is common among people with cancer. It may be the first visible sign of the disease. In fact, 40% of people say they had unexplained weight loss when they were first diagnosed with cancer. Weight loss associated with cancer may be different than other types of weight loss.
So what is the magic number to lose weight and keep it off? According to the Centers for Disease Control and Prevention (CDC) , it's 1 to 2 pounds per week. That means, on average, that aiming for 4 to 8 pounds of weight loss per month is a healthy goal.
POTENTIAL NEGATIVE EFFECTS OF RAPID WEIGHT LOSS STRATEGIES
One potentially serious side effect is severe dehydration. Research indicates that even a 2% drop in water weight can lead to increased mental fatigue, sleepiness, nausea, vomiting, and apathy (10,19,38).
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).
In terms of how your body looks, “it usually takes 4 weeks for your friends to notice weight loss, and 6–8 weeks for you to notice,” says Ramsey Bergeron, a certified personal trainer. “Your friends who don't see you every day are much more likely to see a change than someone you're around all the time,” he adds.
An aggressive calorie deficit is anything more than 30% of your current maintenance calories.
But do you really know what's realistic? Over the long term, it's smart to aim for losing 1 to 2 pounds (0.5 to 1 kilogram) a week. Generally to lose 1 to 2 pounds a week, you need to burn 500 to 1,000 calories more than you consume each day, through a lower calorie diet and regular physical activity.
Clinically important weight loss is generally defined as loss of more than 5 percent of usual body weight over 6 to 12 months [1,2].