At least 3 weeks of it to confirm there was real improvement, although the full course of the diet could last 2 years to eliminate major problems like Crohn's, 3 for Lyme. Not easy, it requires cooking and eliminating for a time foods most people don't want to give up. The first day or two is largely soup and vegetables, then adding in new foods over many days to see if you have a negative reaction to them. The whole diet is refined sugar, grain, and processed-food free.
If you were my daughter I wouldn't hesitate to feed her the GAPS Introduction diet from the book I mentioned here. https://greatawakening.win/p/12igmKX8kt/x/c/4E0yJXuXdto
At least 3 weeks of it to confirm there was real improvement, although the full course of the diet could last 2 years to eliminate major problems like Crohn's, 3 for Lyme. Not easy, it requires cooking and eliminating for a time foods most people don't want to give up. The first day or two is largely soup and vegetables, then adding in new foods over many days to see if you have a negative reaction to them. The whole diet is refined sugar, grain, and processed-food free.