That almond milk latte may be delicious, but a study just published in the Journal of Food Science and Technology suggests that the trendy beverage also has some drawbacks. When researchers compared the nutritional profiles of four popular “alternative” milks, they found that soy milk came out on top—and that almond, rice and coconut “milks” all lacked essential nutrients important for overall health.

Plant-based “milks” are often marketed as wholesome and appropriate substitutes for the real thing. To find out if these claims measured up, scientists at McGill University in Canada studied the nutrition labels of several unsweetened almond, soy and rice milks, plus coconut dairy-free beverages, on grocery-store shelves.

Cow’s milk, the researchers say, is still the most complete and balanced source of protein, fat and carbohydrates. Soy milk, a popular alternative option for more than four decades, was found to be the most comparable to cow’s milk in terms of overall nutrient balance. It’s also the highest in protein of all the alternative milk options studied, with about 7 to 12 grams (and about 95 calories) per 8-ounce serving.