Tom kha gai is hearty enough to make a meal of, but it's much slimmer on calories than it is on flavor. This soup, which usually contains coconut milk, mushrooms, kaffir lime leaves and chicken, is a staple at Thai restaurants but can also be made at home.
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Tom kha gai recipes vary somewhat, as will the calorie count. A homemade recipe may contain between 300 and 350 calories per serving, and the count could go up if you use added sugar or more chicken.
Calories in restaurant versions may be comparable; one Thai eatery's thom kha gai contains 357 calories in a serving of 1.5 cups. If you're making soup at home, you can reduce the calorie count by using less coconut milk, which is very rich at 455 calories per cup, according to the USDA Nutrient Database.