How can you stimulate the production of brown fat?

Exercise stimulates an enzyme called irisin which helps turn white fat into brown fat.

Ursolic acid (found in apple peel and other foods) can boost the body's production of brown fat.

Melatonin can help increase beige fat (which is like brown fat).

Being cold (i.e. shivering) makes brown fat more active (meaning more calories are burnt).