Recent findings highlight that drinking coffee with oat milk on an empty stomach can cause sharp fluctuations in blood sugar levels, leading to energy crashes, fatigue, and increased cravings later in the day. Oat milk, while popular for its taste and plant-based appeal, contains more carbohydrates and less protein and fat compared to other milk alternatives, causing sugars to be absorbed quickly. Dietitians emphasize that the problem is not oat milk itself, but consuming it without other nutrients, especially in the morning after an overnight fast. To avoid negative effects, experts recommend pairing coffee with oat milk alongside sources of protein, fat, and fiber, or choosing alternatives like soy, almond, or cow's milk for better blood sugar stability. Small changes to the morning routine can help maintain energy and mood throughout the day.