- “Squeeze a grapefruit. One grapefruit a day can reduce arterial narrowing by 46 percent, lower your bad cholesterol level by more than 10 percent, and help drop your blood pressure by more than 5 points.” The New Abs Diet: The 6-Week Plan to Flatten Your Stomach and Keep You Lean for Life (The Abs Diet) (David Zinczenko and Ted Spiker). Page 25