Good to read I am an outlier. I would definitely not say I3G is causing this, I have felt it at times during previous diet phases the last several years. I can't find any training variable I could attribute. I've felt it during a carb fast while during times when I was not able to train.
I had thought that whatever mechanism was causing it, it was a trigger around fat loss, and I was guessing I3G was just doing its job. I had been starting to see some loss of strength-endurance in my training, but still strong on big lifts in the low rep range. The I3G has definitely helped because I have seen strength come back, despite losing additional fat the last few weeks.
I am eating 30g carbs or 60g (training days) in the 30-120min after I dose I3G. It is meat, eggs and green veggies the rest of the day, with the occasional sweet potato with the last whole food meal of the day. I am thinking tomorrow I will cycle in a day of higher carbs and very low fat, and then for the other days I will up the peri-workout carbs a little more, and drop the fat cals a little. Are there recommendations for macros with I3G? I am still trying to stay in the 10-11cal/lb range, that seems to be the right amount for consistent slow progress. My maintenance unfortunately is only 12cal/lb. with 4-5 training days, plus 1 HIIT day.
I have consistently read that 10% is the range when the body becomes more anabolic. I've been trying for some time to get into the lean range where all of this becomes more manageable. I haven't yet gotten to the place where a 3-5lb weight gain is more muscle than fat.