Long time reader, first time poster...
Long story short, I get chronic chest infections and found part of it is due to some food allergies, specifically soy and dairy. So last year I tried to do a super rando series using mostly Perpetuem and Fizz. While I did fine at the 200k, 300k, and 400k I noticed around the 400k to 600k marker the soy allergy wore me out too much.
Since finding out these allergies I've been trying several food plans but nothing gets me safely past the 300K mark as well as the Perpetuem. I'm finding I feel great till about 100 miles and then between 100 and 140 I run low on something and my body just wants to shut down. What I've been trying is any combination of Fizz, shot bloks, hammer bars (these seem to not sit well and are too oily), granola bars, mixing in a small bit of rice/hemp protein mix around the 60+ mile marker.
So I'm wondering if anyone knows of a soy/diary free option that is similar to Perpetuem. Or if anyone knows of how Perpetuem works that I can't seem to supplement via the options above.