I picked up a book on "Five-a-Day, fruit and vegetable cooking" sometime ago. What it says makes sense to me anyway. If we need to eat fruits and vegetables, why not eat different types of them together as a dish. Each vegetable or fruit has its own plus points. For example, petai (stinking bean) which has a very pervasive smell but is considered a very highly sought after ingredient in Malaysia especially when cooked with 'sambal belacan' and dried shrimps.
Lemongrass is very good for expelling air from the stomach. It is also widely used in the Asian confinement period to assist new mothers to rid themselves of the discomfort of bloating by belching and flatulence.