Yes, butter and cream can help balance overly spicy food. The fat content in these dairy products binds to capsaicin, the compound that causes the sensation of heat, reducing its impact.
Capsaicin, the active component in chili peppers responsible for the burning sensation, is a non-polar molecule. This means it dissolves best in fats and oils, rather than water. When you consume something spicy, capsaicin binds to receptors in your mouth, triggering the feeling of heat.
Butter and cream are high in fat. When you eat them with spicy food, the fat molecules in the dairy bind to the capsaicin molecules. This effectively 'captures' the capsaicin, preventing it from binding as strongly to the pain receptors in your mouth. This reduces the intensity of the burning sensation. The higher the fat content, the more effective the dairy product will be at neutralizing the spice. Full-fat milk, yogurt, or even a dollop of sour cream can also work, though they may be less effective than butter or heavy cream due to their lower fat content.
Don't reach for water when your mouth is on fire! Water can actually spread the capsaicin around, making the burning sensation worse. Instead, opt for a glass of milk or a spoonful of yogurt for faster relief.