If you have sleep apnea and find it hard to manage your weight, you are not alone. Extra weight worsens sleep apnea, and sleep apnea makes weight loss more difficult. I’ll explain why this cycle happens, what the research says about breaking it, and what treatment options are available for people who haven’t found relief with CPAP.
How Extra Weight Leads to Sleep Apnea
Extra weight is the single biggest risk factor for obstructive sleep apnea (OSA). When you gain weight, fat builds up in the tissues around your throat, including your tongue and soft palate. The walls of the throat get narrower. The tongue gets larger. The soft palate gets thicker. These changes make your airway smaller and more likely to close when your muscles relax during sleep. A study published in 2000 showed that a 10% weight gain increases the apnea-hypopnea index (AHI) by about 30%.
How Sleep Apnea Contributes to Weight Gain
Many people are surprised to learn that sleep apnea can also lead to greater weight gain. Disruptions in sleep cause many changes that can contribute to weight gain.
Ghrelin is a hormone that makes you feel hungry. Levels normally increase during fasting and decrease after eating. However, people with sleep apnea have higher levels of ghrelin, even after eating. Feeling hungry tends to lead to more eating and more weight gain.
Leptin is a hormone that makes you feel full or satiated after a meal. Levels of this hormone are high in people with sleep apnea. Scientists believe that the body becomes resistant to leptin, so you keep making more but don’t get the normal response of feeling full.
Sleep apnea also increases the stress hormone cortisol, which leads to more stored fat around your belly. Fat in this location worsens sleep apnea.
Disrupted sleep also affects the part of your brain that helps with self-control and decision-making. When you are tired, it is harder to choose steamed fish and vegetables over a bacon cheeseburger and fries.
This creates a vicious cycle where extra weight makes sleep apnea worse, poor sleep increases hunger and unhealthy food choices, and weight increases. Without help, this cycle can be difficult to stop.
Why Losing Weight Is Harder When You Have Sleep Apnea
I understand the challenges and frustrations of my patients who are trying their best but still cannot lose weight. Feeling tired makes it harder to exercise and stay motivated. The hormones controlling hunger get out of balance, and it is more difficult to resist temptation. If you’ve tried to lose weight with untreated sleep apnea and found it almost impossible, there is a real reason for that.
What the Research Says About Weight Loss and Sleep Apnea Severity
The good news is that weight loss does make a meaningful difference. Research has shown that losing 10% of your body weight reduces the apnea-hypopnea index, the standard measure of sleep apnea severity, by about 26%. For someone weighing 200 pounds, that is a 20-pound loss leading to roughly one quarter fewer breathing events per night.
Medical Weight Loss With Tirzepatide
Conversations about weight loss changed with the development of GLP-1 drugs such as semaglutide (Wegovy). Patients who struggled for years to lose weight now have hope. Many of my patients taking these drugs lost significant weight and saw a major improvement in their sleep apnea. The newer GLP-1/ GIP medication tirzepatide (Zepbound) is even more effective for weight loss.
In the SURMOUNT-OSA trial, participants with sleep apnea who took tirzepatide for a year lost 18-20% of their body weight. Significant improvements in sleep apnea severity were seen in most patients. Up to 50% of participants were considered cured of their sleep apnea and no longer needed CPAP therapy. Currently, tirzepetide is covered by many insurance plans for the treatment of moderate to severe obstructive sleep apnea patients with obesity (BMI 30 or higher).
Unfortunately, without significant changes in eating habits and physical activity, weight loss is difficult to maintain when the drugs are stopped. For most people, this means that this will be a long-term treatment.
Eating Habits
Changing long-established habits is a difficult task. I have found that making small, incremental changes in my diet over time has led to me eating much better than I did 10 or 20 years ago. Initially weighing my food and tracking calories helped me understand how many calories I was actually consuming. Skipping snacks, swapping out pasta for roasted vegetables, and eating lean meat and fish are some of the changes I have made to improve my health. Reducing alcohol intake and having berries for dessert also helped.
For some people, working with a registered dietitian or participating in a program such as Weight Watchers or Noom can provide structure and support for weight loss and maintenance. Caloric restriction alone helps most people achieve 10% weight loss and measurable improvement in their sleep apnea severity.
Exercise to Maintain Weight Loss
Exercise by itself rarely produces significant weight loss. However, exercise will help you maintain weight loss, preserve muscle mass, and improve your metabolism and overall health.
Aerobic exercise can also reduce sleep apnea severity. A randomized controlled trial found that 150 minutes per week of moderate aerobic exercise significantly reduced the apnea-hypopnea index in overweight adults with sleep apnea, regardless of whether they lost weight. The addition of strength training preserves lean muscle mass and improves function.
The benefits of exercise are powerful and indisputable.
Weight Loss May Not Cure Sleep Apnea
Weight loss will improve your health in many ways, reducing complications of diabetes, heart disease, cancer, arthritis, and sleep apnea. However, sleep apnea may persist despite your weight loss efforts.
If moderate to severe sleep apnea is not treated, it increases your risk for high blood pressure, coronary heart disease, atrial fibrillation, heart failure, stroke, and dementia. Even people with mild sleep apnea can have symptoms that reduce the quality of their lives.
If you’ve been told CPAP is your only option, or if your current treatment isn’t working, it’s worth getting a second opinion from someone who understands that sleep apnea treatment is not one-size-fits-all. There are surgical and non-surgical alternatives, and the right approach depends on your goals, lifestyle, and anatomy.
If you think you might have sleep apnea, I recommend you talk to your primary care physician. If you have a sleep apnea diagnosis and your current treatment isn’t working, I’m here to help.
References:
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