The Japanese Okinawa Diet is designed to increase longevity through lifestyle. It divides foods into four groups according to their caloric density. They include heavyweight, middleweight, lightweight and featherweight foods. Featherweight foods contain 0.7 calories per gram or less. You can eat as many featherweight foods as you want every day without gaining weight.
Fresh Vegetables
Several vegetables count as featherweight foods, with 0.5 or fewer calories per gram. The Okinawa Diet specifies these vegetables are to be eaten fresh. They include broccoli, squash, pumpkin, green peas, asparagus, cucumbers and leafy green vegetables such as spinach. The diet recommends eating six to 13 portions a day for optimum benefit.
Fresh Fruit
Most fresh fruit counts as featherweight food. Apples, berries, grapes, peaches and citrus fruits such as oranges and grapefruit can be eaten in large amounts. The Okinawa Diet advises eating at least two to four servings of fresh fruit each day.
Other Foods
A few other items also qualify as featherweight foods, according to the Okinawa Diet. They include fat-free yogurt and tofu at 0.6 calories per gram and water-based vegetable soup at 0.3 calories per gram. The recommendation is to eat two to four servings of any of these daily. The diet also recommends green tea as a featherweight beverage.
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