When you squeeze a lemon (or peel an orange), save the skin. Scientists at De Montfort University in the United Kingdom found that a compound in tangerine peel called salvestrol Q40 kills an enzyme that spurs the growth of human cancer cells. Previous research has shown that limonene, a compound found in lemon, orange and grapefruit peel, might also decrease cancer risk. Zest the well-washed fruit (toss the bitter white pith) and add to soups, baked goods, yogurt or hot tea.
