I had the lactose and fructose test at Mayo before my LYNX surgery. They were both negative. After surgery I still had to take meds, still had high A1C and a host of other problems. I cut out fruit and it changed my life. My point being don’t relay on these tests they are not always correct. It’s better to cut out food groups one at a time and see how you feel. You’ll know in a few weeks. A good start is lactose. Cut out all dairy. Then if no change in how you feel in a few weeks slowly add back one item at a time. Next cut out all fruit, by the way I got my A1C down to 5.7 but couldn’t get it lower until I found out that things like cucumbers and peppers are also considered fruit! Once I cut that out my A1C went to 5.4! My doctor was shocked. Now if I eat something that I shouldn’t I have problems for 2-3 days so it’s not worth it! As far as SIBO once again don’t wait for a test treat yourself as though you have it, it won’t hurt you if you don’t but change your diet. A good probiotic, no sugar in any form including breads and pastas, drinks, protein bars. Yes i know what does that leave you to eat!! Not much, eggs proteins and some vegetables! I can tolerate cheese and whey protein, but watch the protein bars some are very high in fiber and I have a hard time digesting them. I know it’s a lot of work but when you find the hidden food you will feel sooo much better it will be worth it!