I'm just entering my third week and the main side effects I'm noticing seem to be all associated with the "delayed gastric emptying". It used to be that I could eat an enormous meal and I would stop being full relatively quickly. Now I feel full all the time even if I haven't eaten for a full day which blows my mind. For me I believe my gut flora are converting to a lot more fermentation which has led to a lot of cramps (and heavy winds). My doctor told me to stay extra hydrated and that when I do get hungry not to overdo it since the food will be sticking around much longer now. Feels like a brick is lodged in my GI tract constantly, so I just want to minimize the size of that brick. So in a way constipation is a feature not a bug. I think I'll try the electrolytes (Mg), but I'm scared to use a bulk-forming fiber supplement for fear it'd just grow the brick. If the electrolytes don't help maybe I'll ask my doc about a stool softener.
Good luck! Hope we both find success reducing our risks for cardiovascular diseases.