There is no defined limit on the capacity of the brain. The brain's capacity cannot be measured as it is not subject to a defined "space" where the memory is kept, and it is not such that each neuron is responsible for a single memory. The brain has complex mechanisms of memory storage, that even improve if trained.
Lose body fat or weight.
Losing weight, even 10-20% can reduce your risk of diabetes and lead to the treatment of it.