Millions of people experience problems digesting foods due to conditions like glucose intolerance. Glucose intolerance is defined as having higher than normal blood glucose levels, especially a fasting level over 6 mmol/L or over 7.8 mmol/L two hours after consuming 75g of glucose. People with glucose intolerance have trouble regulating their blood sugar levels regardless of food choices. Symptoms of glucose intolerance include excessive tiredness, dry mouth, frequent urination, vision issues, and reduced muscle mass. These symptoms match those of type 2 diabetes, so it is important for anyone experiencing them to see a doctor and check their blood sugar levels.