If your C-peptide test shows 7.69 and you’re not diabetic then it’s fine. Feeling empty stomachs and weakness can happen for different reasons. It’s common to have low energy when an individual hasn’t eaten anything for a while and this can be solved by taking small but frequent meals. Weakness could be due to lack of sleep, stress or not eating well-balanced meals. Ensure that you always take plenty of fluids and get enough rest.