Physical Activity Linked to Lower Type 2 Diabetes Risk in Study

What the Research Shows About Exercise Volume and Diabetes Risk

Higher volumes of moderate-to-vigorous physical activity (MVPA) correspond to a substantially lower risk of developing type 2 diabetes (T2D). Researchers from Leiden University Medical Centre analyzed 87,975 adults without a prior diabetes diagnosis from the UK Biobank study. Over a median follow-up of 7.7 years, 2,140 participants developed T2D.

Participants in the lower-activity group logged a median of 121 minutes of weekly MVPA, falling short of standard public health guidelines. Those in the higher-activity group completed a median of 409 minutes each week. After adjustments for age, sex, ethnicity, education, deprivation, smoking, sleep duration, and family history, adults in the lower-activity category had twice the relative risk of developing T2D compared with the higher-activity cohort.

How Age and Underlying Conditions Alter Relative and Absolute Risk

Age altered both relative risk differences and the total number of preventable cases. Among participants younger than 63 years, doing lower levels of activity more than doubled the relative risk of developing T2D compared to doing higher levels. For adults aged 63 and older, lower activity levels correlated with a 65 percent higher relative risk.

Older adults face a higher baseline risk of metabolic disease, which shifts the public health impact. Dr. Diana van Heemst noted that while relative protection was steeper in younger adults, encouraging higher activity could prevent more total cases among older people. The authors also found that underlying prediabetes influenced the relationship between physical activity and diabetes risk.

What Timing Data Revealed About Afternoon and Evening Movement

Participants who performed most of their exercise between 1 p.m. and midnight had a 10 percent lower relative risk of T2D compared to those exercising between 5 a.m. and 1 p.m. The research team evaluated timing using wrist-worn accelerometers worn for seven consecutive days between February 2013 and December 2015.

The authors concluded that these timing observations do not warrant changing general activity recommendations. The primary protective association remained the total accumulated volume of weekly movement rather than the specific hour of the day.

Study Limitations and Clinical Interpretation

The observational design of the study prevents establishing direct cause and effect between activity volume and diabetes prevention. The UK Biobank cohort in this analysis had an average age of 63 years, was 57 percent female, and was 97 percent white. These demographic factors limit generalization to more ethnically diverse populations with differing baseline metabolic risks.

Physical activity was tracked during a single seven-day window, which may not capture long-term behavioral changes across the nearly eight-year follow-up period. Individuals considering changes to their physical activity routine or managing prediabetes should speak with a qualified clinician.