Coffee can affect blood sugar differently depending on the individual. The caffeine in coffee may temporarily reduce insulin sensitivity and trigger the release of stress hormones, leading to higher blood sugar levels in some people, especially those with diabetes or insulin resistance. Plain black coffee is generally a healthier choice than sugary coffee drinks because it contains no added carbohydrates. Monitoring your blood sugar before and after drinking coffee can help you understand your body\'s response. Consuming coffee in moderation as part of a balanced lifestyle can support better long-term metabolic health.