1/2 a grapefruit changes insulin for 2 hours

Eat a grapefruit before your meals.

In a recent California study, doctors discovered that eating half a grapefruit before meals helped patients reduce their insulin levels for 2 hours after eating. The patients who ate the grapefruit before meals lost 1.6kg on average, compared to 0.3kg lost by the patients who were not given the grapefruit, making grapefruit 433% more effective at burning fat compared with dieting alone.