Weight loss affects far more than the number shown on a scale, triggering a range of changes throughout the body, some expected and beneficial and others surprising. People often focus initially on how much weight they shed, but the transformation extends to energy levels, sleep quality, skin elasticity, and disease risk, according to health information site Health.
One of the first changes people notice is increased energy. A study found that weight loss reduces the total energy the body needs to maintain its basic functions, such as breathing. Additionally, weight loss lowers the energy required for physical activity and resting energy expenditure, meaning the body needs less fuel to perform daily tasks once someone weighs less.
Skin sagging is an unwelcome surprise for many after significant weight loss, as the skin loses some of its elasticity and drooping may appear on the abdomen, arms, and face. Staying hydrated, managing stress, and using appropriate moisturizers can help improve the appearance and texture of skin, while in severe cases a doctor may recommend cosmetic surgery to address excess skin.
Weight loss often leads to adoption of new healthy habits that people maintain afterward. A review of multiple studies found that interventions based on changing habits helped people lose substantial amounts of weight within 8 to 14 weeks, with participants performing daily health tasks, following a new diet, and exercising regularly. Gradually committing to a healthy diet and regular exercise can establish a more lasting lifestyle change.
Weight loss and fat reduction correlate strongly with improved sleep quality, as excess weight increases the risk of sleep apnea, a breathing disorder that partially or completely blocks the airway during sleep. Fat deposits in the neck area can narrow the airway, disrupting breathing and sleep, according to Dr. Adam Gilden Tsai. Weight loss means less tissue obstructing the airway and fewer soft tissues blocking the upper airway.
Maintaining a healthy weight helps prevent diseases including diabetes and heart disease, and weight loss can benefit people already diagnosed with these conditions. In some cases, people with type 2 diabetes can manage their condition better with weight loss and may control the disease without daily insulin injections. However, patients must not stop taking any medication without consulting a doctor first, who can provide necessary oversight if the person's health allows such changes.