Nutritionists recommend five kinds of food that won't gain weight during the summer

Celery 

You'll get the most antioxidants out of celery if you eat it when it's fresh. Almost 95% of celery is water, but that doesn't mean the vegetable doesn't have significant health benefits. Celery contains potassium, folate, fiber, and 30% of your daily requirement of vitamin K. There are only six calories in a single serving. You're best off eating celery when it's fresh, though. The vegetable loses many of its antioxidants within five to seven days of being purchased. 

Kale 

Kale is light in calories — one cup of raw kale only has about 33 calories — but it contains close to three grams of protein and 2.5 grams of fiber per serving. It's one of the relatively few foods that contains an omega-three fatty acid, a nutrient that most people rely on fish to get. Like other kinds of lettuce, kale is also high in vitamins and folate. 

Cucumbers 

Tomatoes are best known for the fact that they contain lycopene, a carotenoid, which helps fight against chronic diseases and also gives the fruit its red color. Besides lycopene, tomatoes are high in vitamins A, C, and B2, as well as folate, chromium, potassium, and fiber. And for all the nutrients it boasts, one medium-sized tomato only has around 25 calories. 

Grapefruits 

Grapefruit has long been known as a fruit that can help with weight loss. Studies have shown that adding grapefruit to your diet can increase weight loss, which is often why it's considered a diet food. This is because grapefruits are high in fiber, which keeps hunger at bay by stabilizing blood sugar levels and helping you feel fuller for longer. There are only 50 calories in one half of a grapefruit. The vitamin C found in grapefruit can reduce the risk of a number of health problems, like cancer and heart issues. Grapefruit can also work wonders in lowering cholesterol and improving digestion, and the folate found in the fruit makes it an ideal snack for pregnant women.

Broccoli 

Broccoli is most nutritious when eaten raw or when steamed. This super vegetable contains sulforaphane, an anticarcinogen that works to destroy cancer-causing chemicals that the body might take in either through the environment or through food. Besides vitamins A, C, E, and K, one serving of steamed broccoli contains approximately 20% of your daily fiber requirement. Plus, there are only about 31 calories in one serving.