Prediabetes and Type 2 Diabetes: What Weight Loss Can Do
More than 2 in 5 US adults have prediabetes, and it often goes undetected. Modest weight loss can cut your risk by more than half, and type 2 diabetes can sometimes go into remission.
The short version
- An A1C of 5.7 to 6.4% means prediabetes. 6.5% or higher, confirmed by testing, means diabetes.
- In people at high risk, losing about 7% of body weight and exercising 150 minutes a week cut progression to diabetes by 58%.
- Type 2 diabetes can go into remission with significant weight loss, especially early on.
- If you take diabetes medication, adjust your diet with your care team, as low blood sugar can be dangerous.
Know your numbers
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| A1C | Below 5.7% | 5.7 to 6.4% | 6.5% or higher |
| Fasting glucose | 99 mg/dL or less | 100 to 125 mg/dL | 126 mg/dL or higher |
| 2-hour glucose test | 139 mg/dL or less | 140 to 199 mg/dL | 200 mg/dL or higher |
Prediabetes usually has no symptoms. Ask about testing if you carry extra weight, have a family history, had gestational diabetes, have PCOS, or are 35 or older, which is when routine screening often starts.
What the research shows
Prevention. The Diabetes Prevention Program followed more than 3,000 adults at high risk. Those who lost about 7% of their weight and got 150 minutes of activity a week reduced their risk of developing diabetes by 58% over about three years. Metformin reduced it by 31%. Among those 60 or older, lifestyle change cut the risk by 71%.
Remission. In the DiRECT trial, 46% of people who'd had type 2 diabetes for up to six years were in remission a year later after a structured weight-loss program. The more weight people lost, the more likely remission was. Remission doesn't mean a cure. Diabetes can come back if weight returns, and regular checkups still matter.
What to do
Food
No single diet is best. Mediterranean, DASH, lower-carb and plant-based patterns can all work. What they have in common:
- Plenty of non-starchy vegetables, using the plate method
- More fiber from beans, whole grains and vegetables
- Fewer sugary drinks and refined carbs
- Enough protein
- Regular meals, if you're on medication
Movement
- Aim for at least 150 minutes a week, plus strength training twice a week.
- Walk after meals, even for 10 minutes. This can blunt blood sugar spikes.
- Break up long periods of sitting.
Sleep
Poor sleep worsens insulin resistance. Get checked for sleep apnea if you snore or feel tired during the day.
Get structured support
The CDC-recognized National Diabetes Prevention Program offers a year-long coaching program based on the original research, and it's available in person and online. Many insurance plans and Medicare cover it.
Medication
Metformin is commonly used, and GLP-1 medications improve blood sugar and weight. Needing medication isn't a failure. It's treatment for a condition that's strongly influenced by genetics and biology.
Sources
This guide is general information, not medical advice. Please check with a clinician before making big changes, especially if you have a health condition, take medication, or are pregnant. Read the full disclaimer.
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