Warm house, lower BMI

The study included 100,000 adults drawn from 13 successive waves of national health surveys and showed that those who lived in houses with ambient indoor temperatures above 23°C had lower BMI than those living in houses kept at 19°C or below.

After adjusting for age, gender, social class, health and year and month of assessment, the association between high indoor temperatures and low BMI was even stronger.

The link between high indoor temperatures and low BMI was found to be 35% as great as the change in BMI moving