If you suffer of digestive discomfort when you eat, you may have problems with FODMAPs.
According to Wikipedia:
FODMAPs or fermentable oligosaccharides, disaccharides, monosaccharides, and polyols are short chain carbohydrates that are poorly absorbed in the small intestine and are prone to absorb water and ferment in the colon.
This app is a food list and FODMAP level, which can help you choose what to eat or what to avoid.
The app should be used as an auxiliary consultation source, but it does not replace an appointment with the doctor and/or nutritionist.