I noticed that almost all types of cooking oil (vegetable oil, olive oil, peanut oil, etc) contain some saturated fat. Since saturated fat is known to be a contributor to heart disease, then could you simply remove the saturated fats from the oil to make it healthier?
Might be because fats are very energy dense. They net about 9 calories per gram. However, if the app is only tracking calories without context, it is going to miss calories-over-time and satiety. Fats tak longer to metabolize and tend to be good at triggering and maintaining feeling sated.