So-called vices like wine, partying and chocolate provide the fourth rule, with countless studies showing that a little of what you fancy does you good rather than harm.

• 所谓的生活陋习,如饮酒、参加社交聚会和吃巧克力,成为保证长寿的第四大法则。众多研究表明,稍稍满足一下这些嗜好,不仅对身体无害,反而有益于健康。