Everyone loses weight differently, and eating a vegetarian diet can lead to weight loss if you decrease your intake of processed foods and increase eating more whole foods with healthy proteins, fats, and complex carbs. On average, vegetarians have a lower BMI than most people. While a lower BMI is correlated with eating, it’s not guaranteed and a cause-effect relationship between weight loss and vegetarianism is inconclusive. What eating a vegetarian diet can do is increase your own awareness of what you’re eating, which can lead to weight loss should you start choosing healthier foods.