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To lose one pound of body weight, you typically need to create a calorie deficit of roughly 3,500 calories. This can be achieved through reducing calorie intake, increasing physical activity or both.
[1] Example for a weight loss goal: −2 (most unfavorable outcome): gain 5 pounds in 1 month; −1 (less than expected outcome): maintain weight over a 1-month period; 0 (expected outcome): lose 5 pounds in 1 month +1 (greater than expected outcome): lose 10 pounds in 1 month +2 (most favorable outcome likely): lose 15 pounds in 1 month
A permanent severe deficit, on the other hand, which contains too few calories to maintain a healthy weight level, will eventually result in starvation and death. To reduce 1 kg (2.2 lbs) of weight, about 7000 kcal deficit is required.
The Harris–Benedict equation (also called the Harris-Benedict principle) is a method used to estimate an individual's basal metabolic rate (BMR).. The estimated BMR value may be multiplied by a number that corresponds to the individual's activity level; the resulting number is the approximate daily kilocalorie intake to maintain current body weight.
Dieting is the practice of eating food in a regulated way to decrease, maintain, or increase body weight, or to prevent and treat diseases such as diabetes and obesity.As weight loss depends on calorie intake, different kinds of calorie-reduced diets, such as those emphasising particular macronutrients (low-fat, low-carbohydrate, etc.), have been shown to be no more effective than one another.
Mild calorie restriction may be beneficial for pregnant women to reduce weight gain (without weight loss) and reduce perinatal risks for both the mother and child. [11] [12] For overweight or obese individuals, calorie restriction may improve health through weight loss, although a gradual weight regain of 1–2 kg (2.2–4.4 lb) per year may occur.
The two types of procedures have shown a 26% weight loss from baseline at five years with an 86% remission rate in diabetes and 68% hypertension remission rate. [6] Of those adolescents who lost weight after bariatric surgery, 60% maintained at least a 20% weight loss at five-year follow-up and 8% had regained most of the pre-surgical weight. [6]
One study found a weight loss of between 14% and 25% (depending on the type of procedure performed) at 10 years, and a 29% reduction in all cause mortality when compared to standard weight loss measures. [214] Complications occur in about 17% of cases and reoperation is needed in 7% of cases. [212]