References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Weight gain has become one of the most commonly discussed side effects of modern HIV treatment, particularly integrase inhibitor-based regimens like dolutegravir and bictegravir. For some people, the gain is modest; for others, it can be significant and distressing. The causes are likely a mix of the medication itself, the improved health that comes from effective treatment, and individual factors like diet and activity levels.
Here’s a practical, non-judgmental guide to managing your weight while living with HIV.
Order a discreet home HIV test
Why Does HIV Treatment Cause Weight Gain?
The reasons are not fully understood. Contributing factors include:
- Return-to-health effect — when HIV is treated, the body stops burning energy fighting the virus and appetite returns
- Integrase inhibitors — associated with more weight gain than older drug classes in clinical studies
- TAF (tenofovir alafenamide) — associated with slightly more weight gain than TDF
- Individual metabolism, genetics and lifestyle
How Much Weight Gain Is Typical?
| Drug Class | Average Weight Gain in First Year |
|---|---|
| Integrase inhibitors (dolutegravir, bictegravir) | Higher |
| Protease inhibitors | Moderate |
| NNRTIs (efavirenz, rilpivirine) | Lower |
Exact amounts vary widely between individuals. Some people gain no weight at all.
Safe Approaches to Weight Management
Diet
- Focus on whole foods — vegetables, fruit, lean protein, whole grains
- Reduce ultra-processed foods, sugary drinks and takeaways
- Watch portion sizes rather than counting calories obsessively
- Stay hydrated
- Don’t skip meals — it often leads to overeating later
Exercise
- Aim for 150 minutes of moderate activity per week (walking, swimming, cycling)
- Add resistance training — builds muscle and boosts metabolism
- Start small and build up — consistency matters more than intensity
- Find something you enjoy — it’s the best predictor of sticking with it
Medical Options
- Discuss switching ART if weight gain is significant — your HIV team may suggest alternatives
- Check for other causes (thyroid, diabetes, medication effects)
- Weight management programmes through your GP or HIV clinic
- Consider referral to a dietitian
What NOT to Do
- Don’t stop your HIV medication — the health consequences are far worse than weight gain
- Don’t crash diet — extreme calorie restriction can weaken the immune system
- Don’t take unregulated diet supplements — they may interact with ART
- Don’t compare your body to others — everyone responds differently
Read more: What is HIV? | Biktarvy | Dovato
Frequently Asked Questions
Will switching HIV drugs help with weight?
Possibly. Some people lose weight after switching from an integrase inhibitor to a different class. Your HIV team can discuss the trade-offs with you.
Is weight gain on HIV treatment dangerous?
Moderate weight gain itself isn’t usually dangerous, but significant gain can increase cardiovascular risk. Monitoring blood sugar, cholesterol and blood pressure helps manage this.
Can I exercise normally with HIV?
Yes. Exercise is safe, beneficial and encouraged for people with HIV. There are no restrictions for people on effective treatment with a good CD4 count.
Related reading
- Blood Test for Syphilis, Hepatitis B and Hepatitis C
- Can You Get an STI From Being Fingered?
- Can You Catch an STI From a Toilet Seat?
- Can You Clear HPV Once You Have It?
- Can You Die From Hepatitis B?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
