In Indian kitchens, green chillies are commonly used for their spicy flavor. Scientifically, green chillies are called Capsicum frutescens. Capsaicin, a chemical found in green chillies, gives them their spiciness. Improve your eyesight and immune system by using this vegetable in cooking. Known for its antibacterial, antifungal, antioxidant, and anti-inflammatory properties, this must be used instead of red chillies in food. Consumption of green chilli will also improve digestion, control blood sugar level, cure cold and combat mood swings.