I have radiation damage to my small intestines so I have to follow a FODMAP diet (google is your friend) and then I tend to have high glucose readings so I have to combine my FODMAP with a low sugar diet. Strangely enough, it isn't that hard even though its a fairly restrictive diet and coincidentally, it makes a decent cycling diet, too.
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“Train hard until your legs are tanned, then keep going until the shape arrives.” -Jolanda Neff