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This question originally appeared on Quora. Answer by Keck Medicine of USC.

Did you know that some fruits can help you lose weight? Do you know which ones they are?

According to the World Health Organization, eating at least five 80-gram serving portions of a variety of fruits and vegetables every day lowers the risk of serious health problems. Recent studies have also proven that eating certain fruits can help weight loss as well.

These 6 amazing fruits can certainly help you lose those extra pounds:

1. Watermelon

Watermelon is one of the fruits that can help you lose weight. Quora

Because 90 percent of a watermelon’s weight is water, it’s one of the best fruits to eat if you’re trying to lose weight. A 100-gram serving contains only 30 calories. It’s also a great source of an amino acid called arginine, which helps burn fat quickly. In addition to helping the body stay hydrated, a watermelon snack will make you feel full so you won’t have cravings between meals.

2. Guava

Guavas are one of the fruits that can help with weight loss. Quora

A powerhouse of nutrients, guavas can also help weight loss without compromising your intake of proteins, vitamins and fiber. This delicious tropical fruit is packed with roughage, vitamins, proteins and minerals. It’s a win-win when you consider these benefits with it’s small number of digestible carbohydrates and the fact that guava contains zero cholesterol. Raw guavas have much less sugar compared to fruits such as apples, oranges and grapes, and they keep the metabolism regulated.

3. Apple

Apples can help with weight loss. Quora

An apple a day may keep the doctor away, but it can also help you lose weight more quickly. The good news is that eating just one apple a day — with the skin on — gives the body and average of 4.4 grams of fiber, which is about one-fifth of our daily need. Apples are a rich source of a powerful fiber called pectin. Eating apples or pears before meals resulted in significant weight loss according to a study published in Nutrition Journal.

4. Grapefruit

Grapefruit can help with weight loss. Quora

This delicious fruit, which was first created by crossing a pomelo with an orange in the 18th century, is also a fantastic source of pectin. It contains a great amount of vitamin C, folic acid and potassium. Pink and red grapefruits are packed with vitamin A and lycopene, a phytochemical that protects arterial walls from oxidative damage. Eating half a grapefruit about a 30 minutes before daily meals will help you feel more satiated, which will result in less consumption of food and calories.

5. Banana

Bananas can help with weight loss. Quora

Considered the perfect pre- or post-workout snack, bananas are healthier than most energy bars, which often contain lots of sugar and chemicals. Although the average banana contains 27 grams of carbs, the fruit can help stop weight gain because it has only 105 calories and three grams of filling fiber. Bananas are also known to fight muscle cramps, keep blood pressure low and prevent acidity. Just try and stick to one banana a day.

6. Tomato

Tomatoes are a fruit -- and can help you lose weight. Quora

Let’s not forget that the tomato is a fruit and not a vegetable. This powerful red ally is full of antioxidants and can help reduce water retentions. It also fights leptin resistance. (Leptin is a type of protein that prevents our body from losing weight.) Plus, tomatoes are very low in calories; an average-sized tomato is just 22 calories and a large one is 33 calories. Tomatoes are also considered an appetite-suppressant “high-volume” food, which means they have high amounts of water, air and fiber.

It should be evident, but you can’t just burn fat and shed weight by simply eating these seven fruits alone. You will lose weight when you burn more calories than you consume. By exercising and substituting high-calorie food like cheese, meat or rice with low-calorie fruits like tomatoes, you will be able to achieve your ideal weight.

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