Studies showed that people who were given grapefruit before each meal for 12 weeks had a decreased body weight, and improved insulin levels and lipid profiles.
One study showed that women who added three apples per day to their diet for ten weeks reduced their energy consumption during the day and lost weight.
One small study showed that people who snack on berries in the afternoon ate less food at dinner.
They both have around 90% water content, which helps to keep you full and prevents you from bingeing during the day.
As one of the sweetest citrus fruits, oranges are low in calories and high in vitamin C and fiber.
The high fiber and water content help to increase satiety, so you may end up consuming fewer calories throughout the day.