Lemon water is a popular morning drink and, according to a viral CGM experiment, adding a few tablespoons of lemon juice to water appeared to blunt the rise in blood sugar after a carbohydrate-rich meal. Here’s what science says about the benefits and limitations of lemon water.
Health benefits
- Rich in vitamin C and antioxidants. Lemons supply vitamin C and other antioxidants that support immunity and may help lower fasting blood sugar levels and cholesterol.
- Low glycemic and fibre-containing (if pulp is consumed). Lemons have a glycemic index around 20 and contain soluble pectin fibre in the pulp. Soluble fibre slows digestion of sugars and starches and can improve gut health, leading to reduced blood-sugar responses. The American Diabetes Association lists lemons among its diabetes “superfoods” because they’re low in sugar yet high in fibre and vitamin C.
- Hydration without added sugar. Replacing sugary drinks with lemon water lowers overall calorie and sugar intake, which helps with weight management and reduces risk of tooth decay.
Precautions and potential downsides
- Acidic drinks can erode tooth enamel. Lemon juice is highly acidic; frequent exposure can damage enamel and increase sensitivity. A dental article notes that acid can wear away enamel and recommends diluting lemon juice (half a lemon in 12–16 oz of water) and using a straw to minimize contact with teeth. Chewing sugar-free gum after drinking helps stimulate saliva, which neutralizes acid.
- Benefits depend on the pulp. The fibre responsible for slowing sugar absorption is located in the lemon’s pulp, not the juice. People who drink lemon water without pulp will miss out on these fibre benefits.
- Lemon water isn’t a cure-all. While a small study found that citric acid can slow the conversion of starch to glucose, the effect is modest. Lemon water should not replace medications or other evidence-based diabetes treatments.
Bottom line
Lemon water is a refreshing, low-calorie beverage rich in vitamin C and, when consumed with the pulp, soluble fibre. It may modestly reduce blood-sugar spikes and can help replace sugary drinks. However, its acidity can harm tooth enamel, and it shouldn’t be considered a treatment for diabetes. Enjoy lemon water in moderation, dilute it properly, and maintain good oral hygiene.
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