If you have obesity, the major benefits of losing weight probably seem obvious: You’ll look and feel lighter on your feet, and you’ll also be doing your best to reduce the risk of chronic diseases such as heart disease and type 2 diabetes. But that’s just where the benefits begin.
“Obesity can affect every organ system in the body, from the brain and internal organs to every joint,” says Mir Ali, MD, bariatric surgeon and medical director of MemorialCare Surgical Weight Loss Center at Orange Coast Medical Center in Fountain Valley, California. “It causes chronic inflammation that contributes to a wide variety of adverse health issues.”
Losing weight improves these issues, leading to improvements in everything from how you perceive taste and smell to your sex drive.
1. Your Brain Feels Sharper
Obesity can cause brain fog for a number of reasons. It leads to chronic inflammation in the brain, imbalance in the bacteria that affect the brain-gut connection, hormonal shifts, and metabolic issues.
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“Many patients report improved focus, clearer thinking, and better short-term memory after losing even 5 to 10 percent of their body weight,” says Soma Mandal, MD, a board-certified internist and medical director of women’s health at Hackensack Meridian Health’s Jersey Shore University Medical Center in New Jersey.
2. Your Joints Hurt Less
Having a high body mass index (30 or greater is the threshold for obesity) can double your risk of the joint disease osteoarthritis in your knee, and it increases your risk of hip osteoarthritis by 52 percent.
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In turn, losing weight may put less pressure on those joints.
“Excess weight is excess strain on the back and joints, so when people get to a healthier body mass index, that mechanical stress eases,” says Meghan Garcia-Webb, MD, who specializes in internal medicine, lifestyle medicine, and obesity medicine with a private practice in Boston.
3. Food Tastes Better
People with obesity are less sensitive to taste — but preferences for sweet and fat flavors may increase with weight gain, according to research.
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This may lead to unhealthy diet choices.
“Obesity may blunt taste receptor sensitivity and alter dopamine reward pathways,” Dr. Mandal says. “After weight loss, taste perception can normalize, which means natural flavors like fruits and vegetables often taste sweeter and more satisfying.”
This can create a positive feedback loop, making healthier food choices easier to maintain, Mandal adds.
4. You’re Less Likely to Get Sick
People with obesity are more likely to get seriously sick from viral respiratory illnesses such as the flu.
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Too much body fat can cause inflammation, which raises the risk of heart disease and other health problems.
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The more excess weight you carry, and the longer you carry that weight, the more your risk increases.
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“Excess fat can impair immune response,” Mandal says. “Weight loss helps reduce systemic inflammation and improves immune regulation, which may lower susceptibility to infections.”
5. You Sleep Better
Obesity can increase your risk of sleep disturbances, insomnia, and daytime sleepiness.
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If you have obstructive sleep apnea, a condition in which your breathing repeatedly pauses during sleep, weight loss also may improve it. Reducing your BMI by 20 percent, for example, can help cut your sleep apnea-related breathing interruptions in half.
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“The extra weight pushing on your trunk and throat at night can make it harder to breathe, so your body is fighting to get enough oxygen while you are asleep,” Dr. Garcia-Webb says. “When this extra weight disappears, your sleep usually improves as well.”
6. Your Skin Clears Up
“Weight loss can improve insulin sensitivity and reduce inflammatory markers, often leading to clearer skin and improvement in conditions like acanthosis nigricans,” says Mandal, referring to a condition that darkens skin in folds and creases.
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7. Heartburn May Disappear
Obesity increases your risk of gastroesophageal reflux disease (GERD). Excess weight puts added pressure on your stomach, leading to GERD symptoms such as heartburn, burping, and chest pain. Losing just a few pounds can improve these symptoms.
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“When you lose weight around the abdomen, that excess pressure disappears, and often heartburn improves or is eliminated altogether,” Garcia-Webb says.
8. Your Sex Drive Spikes
Losing weight coincides with an improvement in sex drive and sexual function in men and women, according to research.
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It’s not just a matter of feeling more confident in a slimmer body: Weight loss actually rebalances the hormones that help control sex drive. “In men, weight loss is associated with increased testosterone levels,” Mandal says. “In women, improved insulin sensitivity can lower excess androgen levels that otherwise suppress libido, particularly in those with polycystic ovary syndrome.”
Improved body image, stamina, and vascular function also contribute to higher libido and sexual satisfaction, Mandal adds.
9. You Get a Sharper Sense of Smell
People with obesity may have a decreased sense of smell. This is because of imbalances in hormones such as leptin and ghrelin, which regulate appetite and energy balance. These can shift your perception of scents and lead to a preference for unhealthy foods.
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“After weight loss, smell perception may sharpen,” Mandal says. “This may also influence appetite regulation and food enjoyment.”
10. Your Mental Health Improves
People with obesity have a 33 percent higher risk of experiencing depression compared with those without.
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This may be because of imbalanced gut microbiota, inflammation, and hormonal imbalances.
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“Two additional benefits we frequently observe in our weight loss patients are significant improvements in mood and body image,” Dr. Ali says. “It is incredibly gratifying to see patients gain the physical and motivational drive to pursue major milestones, like running marathons or climbing mountains.”
The Takeaway
- If you are living with obesity, even modest weight loss can have numerous positive effects on your physical and mental health.
- Losing weight can adjust how you taste and smell, which may increase your preference for healthy foods.
- Weight loss can reverse some signs of cognitive decline and reduce your depression risk.
- Sleep disturbances, skin issues, and gastrointestinal reflux disease (GERD) also are associated with obesity, and managing your weight effectively may help improve them.
