(a) Representative physical pictures of 18-month-old WT and Atg5 Tg mice fed with a regular diet. (b) Body weight chart of ageing-induced obesity in WT and Atg5 Tg mice. The mice were fed with a regular diet for 24 months (n=180--250) and their body weights were monitored monthly. The bars represent the mean±s.d. ***P0.0001 versus control; Student's t-test. 