- Around 9 in 10 adults with type 2 diabetes in the UK are living with overweight or obesity.
- Losing even 5% of your body weight can noticeably improve blood sugar control.
- In the UK DiRECT trial, almost half of participants were in remission after a year of a structured weight-loss programme.
- If you take diabetes medicines, talk to your GP before changing your diet significantly — doses may need adjusting.
How weight affects blood sugar
When fat builds up inside the liver and pancreas, the body becomes less responsive to insulin and the pancreas struggles to keep up. Blood sugar rises, first into the prediabetes range and then into type 2 diabetes. This is why fat stored around the middle matters so much — your waist-to-height ratio is a useful early warning sign.
Know your numbers
Diabetes is usually diagnosed with an HbA1c blood test. A result of 42–47 mmol/mol suggests prediabetes; 48 mmol/mol or above suggests type 2 diabetes. If you have risk factors — a high BMI or waist, a family history, or a South Asian, African-Caribbean or Black African background — ask your GP about testing.
What weight loss can do
Losing 5–10% of your weight can lower HbA1c, blood pressure and cholesterol, and some people can reduce their medicines. The UK DiRECT trial found that almost half of people with type 2 diabetes on a structured weight-management programme were in remission after one year, and remission was most likely in those who lost 15 kg or more. Remission is most achievable earlier in the condition.
Losing weight safely with diabetes
- Check your medicines. If you use insulin or tablets such as sulfonylureas, eating less can cause low blood sugar (hypos). Your GP or diabetes nurse may need to adjust your doses.
- Focus on quality. Prioritise protein, vegetables and high-fibre carbohydrates; cut back on sugary drinks and refined snacks. See our nutrition guide.
- Move more. Muscles use glucose, so strength training and walking after meals both help.
When to consider medical support
Type 2 diabetes is one of the conditions that can make you eligible for medical weight-loss treatment from a BMI of 27 (24.5 for some ethnic backgrounds). See who is eligible. Always tell the prescriber about your diabetes and all your medicines.
Not sure if medical weight loss is right for you?
Our free online assessment takes about five minutes. A GPhC-registered prescriber reviews it and only recommends treatment if it is safe and suitable for you.
Start the free assessmentFrequently asked questions
Can type 2 diabetes go away with weight loss?
It can go into remission — blood sugar back below the diabetes range without diabetes medicines — particularly after significant weight loss earlier in the condition. It needs ongoing monitoring because it can return if weight is regained.
How much weight do I need to lose?
Benefits start at around 5% of your body weight. In research, remission was most common in people who lost 15 kg or more.
Is the NHS Diabetes Prevention Programme for me?
If a blood test shows you have prediabetes, your GP may refer you to the NHS Diabetes Prevention Programme, which supports weight loss and healthier habits.
This page is general health information. It does not replace advice from your GP or another healthcare professional who knows your history. If you have symptoms that worry you, contact your GP or NHS 111; in an emergency call 999. Prescription treatment is only supplied after an assessment by a registered prescriber.