Low-fat soy milk can cause weight gain if consumed in excess, just like any other food or beverage. However, it can also be a healthy choice if consumed in moderation. Soy milk is a good source of plant-based protein, and is lower in fat and calories than cow's milk. It is also a good source of B-vitamins, calcium, and Vitamin D. Soy milk may also help reduce cholesterol, blood pressure, and the risk of heart disease.
Overall, low-fat soy milk can be a good alternative to cow's milk, particularly for those looking to reduce their fat intake and maintain a healthy weight. It is important to note, though, that it may not be suitable for everyone, as some people may be allergic to soy, or may have difficulty digesting the proteins in soy milk. It is always best to consult with your healthcare provider before making any dietary changes.