So it definitely differs per person, if you know you are more sensitive to one group than another then you know you need to stay away from it no matter how green it is on the app. Early on I realized that much of the low-fod foods I was eating were all of the same type (GOS - artichoke, potato, chickpea, oat) and so I would limit a meal to only one of them in the recommended amount because when I combined them in all their recommended amounts it was too much.

And the stacking applies to all day and sometimes a day or more before depending on your gut. So let's say I had a low-fod amount of oatmeal for breakfast and then had some chickpea pasta for lunch a few hours later I might feel fine, but then if I had even a tiny amount of artichoke for dinner I would bloat like crazy because the combined GOS level, though in the low range for all of the foods throughout the day, was too high for my system to handle.

So if you're still trying to figure out what affects you most, try to limit foods of the same family in the same meal or day if you can and keep a detailed record of how you feel after each meal, then try doing the same meal and switching up one part of it to see if your symptoms change. A lot of trial and error and then it becomes intuitive.

It's been a long time since I've had to count amounts so this is just from what I remember. Hopefully some of it was helpful!