Ever added a squeeze of lemon to milk? It curdles, right? That's what happens in your stomach when you add a banana (or other fruit) to your morning cereal. Bananas become sour as they break down which when combined with milk or yoghurt, results in a not so pleasant curdling experience in your precious gut. This is often the cause of sinus congestion, colds, coughs and allergies. Discover what other food habits may be causing you health problems. Ksham with me.