Could it be that the 15g is for 2 tbsp?
The fat really isn't for GI issues. If it helps for the GI issues, that's good, but Mepron has to be taken with fat because the fat increases absorption significantly (talking like a 4-fold increase in concentration when you eat ~40+ grams of fat:onlinelibrary.wiley.com/doi/10.1111/j.1365-2125.1994.tb04232.x/epdf
It's also outlined in the Mepron monograph.
I usually aim for about
40g of fat. I eat a lot of eggs and fatty meats. Not the healthiest, but sometimes I'll eat cured meats that are high in fat.
My go to when needed is still peanut butter, 3-4 tbsp.
I take the medication about
30-45 minutes after I begin my meal, as outlined in that paper.