I will occasionally use a protein supplement in place of a whole food source and very rarely I use a small dose of super starch by Gen UCAN. (drrosedale.tenderapp.com)
The only thing I would suggest around carbs, is if you are a top athlete (we are talking professional) then I would work closely to calculate the glycogen deficit after each workout and get them just enough Super Starch to restore their glycogen stores. (mariamindbodyhealth.com)
Gluten is one of the worst culprits that has an even bigger problem: it's super starch amylopectin which causes a huge insulin surge. (betterbydrbrooke.com)