Aspartame, a low-calorie sweetener present in diet drinks and many 'lite' snacks, is often the subject of controversy. Despite rumors about potential adverse effects, scientific consensus supports its safety. Notably, aspartame does not cause cancer or raise blood sugar levels. However, individuals who are allergic should avoid it. It's also safe for pregnant women, but consultation with a doctor is recommended. Side effects from aspartame are rare, but could include headaches.