Obesity is a common, chronic medical condition defined as an excess of body fat, usually identified by a body mass index (BMI) of 30 or higher. It affects more than 40 percent of American adults. Obesity is not a matter of willpower — it is a complex disease shaped by genetics, hormones, medications, and environment — and it is treatable. Like other chronic diseases, it tends to relapse and remit, which is why ongoing medical support works better than short-term dieting. Even a modest weight loss of 5 to 10 percent meaningfully improves blood pressure, blood sugar, and cholesterol. Causes and Risk Factors: Weight gain happens when the body stores more energy than it uses, but many forces influence that balance:

Energy imbalance: Calorie intake that consistently exceeds calories burned, though the drivers of that imbalance differ greatly from person to person.
Genetics: Body weight and fat distribution run strongly in families.
Medical conditions: An underactive thyroid (hypothyroidism), polycystic ovary syndrome, and other hormonal disorders can promote weight gain.
Medications: Some antidepressants, steroids, insulin, and seizure medicines are associated with weight gain.
Sleep and stress: Short sleep and chronic stress alter appetite hormones and increase cravings.
Environment and habits: Calorie-dense foods, large portions, and sedentary work and leisure time all contribute.

Health Risks: Excess body fat is metabolically active and affects nearly every organ system. Losing even a modest amount of weight lowers the risk of nearly all of the following conditions:

Type 2 diabetes: Obesity is the strongest modifiable risk factor for diabetes.
Heart and vascular disease: High blood pressure, abnormal cholesterol, heart attack, and stroke are all more common.
Fatty liver: Fat accumulation in the liver can progress to inflammation and scarring (fatty liver disease).
Sleep apnea: Interrupted breathing during sleep causes daytime fatigue and strains the heart.
Joint disease: Extra load on the knees and hips accelerates osteoarthritis.
Certain cancers: Obesity raises the risk of several cancers, including colon and uterine cancer.

Diagnosis: Diagnosis starts with BMI: 25 to 29.9 is classified as overweight, and 30 or above as obesity, though BMI is a screening tool rather than a perfect measure of health. A good evaluation goes further: waist circumference, blood pressure, blood sugar, cholesterol, thyroid testing, and a review of medications and sleep habits. The goal is to understand why weight has changed and what health problems are already present so treatment can be targeted. Treatment: Effective treatment is long-term and usually combines several approaches:

Nutrition changes: A sustainable, reduced-calorie eating pattern matters more than any specific named diet.
Physical activity: Roughly 150 minutes of moderate activity per week, plus strength training, helps keep weight off.
Behavioral support: Regular follow-up, self-monitoring, and realistic goal-setting improve results.
Medications: GLP-1 receptor agonists such as semaglutide and liraglutide reduce appetite and produce substantial weight loss; metformin is sometimes used when insulin resistance is prominent.
Bariatric surgery: For severe obesity, surgery is the most effective durable treatment and can put type 2 diabetes into remission.

Weight regain after initial loss is common and reflects the body's biology, not personal failure; treatment is adjusted over time the same way it is for blood pressure or diabetes. There is no single right path, and the best plan is the one you can maintain. The primary-care team at Zimmer Medical Group can help you build a medically sound weight-management plan — schedule a visit to get started.

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Obesity

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