Taking the diet advice above a bit further, you might consider trying a Keto diet, which is a high fat low carb diet. Keto diets eliminate the blood sugar swing

Taking the diet advice above a bit further, you might consider trying a Keto diet, which is a high fat low carb diet. Keto diets eliminate the blood sugar swings that cause highs and crashes throughout the day, making it significantly easier to focus for long periods of time. Reddit.com/r/keto has a lot of great resources for learning more.