What are the benefits and drawbacks of drinking milk before bedtime?

Mar 13, 2025 Source: Cainiu Health
Dr. Yu Yongchao
Introduction
Generally, the benefits of drinking milk before bedtime include promoting sleep, supplementing nutrition, protecting the gastric mucosa, enhancing metabolism, and relieving hunger. However, potential disadvantages include increased urination, dental caries, fat accumulation, increased gastrointestinal burden, and allergic reactions. It is essential to clean the mouth after drinking milk to prevent tooth decay.

Generally speaking, the benefits of drinking milk before bedtime include promoting sleep, supplementing nutrition, protecting the gastric mucosa, enhancing metabolism, and relieving hunger. However, potential disadvantages include increased urination, dental caries, fat accumulation, increased gastrointestinal burden, and allergic reactions. Detailed explanations are as follows:

I. Benefits

1. Promotes Sleep

Tryptophan in milk is a precursor for melatonin synthesis, and melatonin helps promote sleep and improve sleep quality. Therefore, drinking an appropriate amount of milk before bedtime can help people fall asleep more easily.

2. Supplements Nutrition

Milk is rich in calcium and protein, nutrients that can help prevent or improve osteoporosis in the elderly, and promote bone development in adolescents, preventing rickets and malnutrition.

3. Protects the Gastric Mucosa

Milk helps protect the gastric mucosa. People who secrete excessive gastric acid may experience some relief from stomach discomfort by drinking a glass of milk before bedtime.

4. Enhances Metabolism

Milk contains abundant vitamin B; drinking it before bedtime can help promote metabolism, aid in the elimination of metabolic waste, and improve circulation.

5. Relieves Hunger

If there is a long interval between dinner and bedtime, one may feel hungry before sleeping. Drinking a glass of milk at this time can help alleviate hunger and prevent waking up due to hunger during sleep.

II. Disadvantages

1. Increased Urination

Drinking milk before bedtime may increase body fluid volume, leading to more frequent nighttime urination and thus affecting sleep quality. It is recommended to drink milk at least one hour before bedtime and avoid consumption immediately before sleeping.

2. Dental Caries

Failure to thoroughly clean the teeth after drinking milk before bedtime, especially in children, may result in fermentation products coating the mucosa and tooth surfaces, increasing the risk of dental caries. Therefore, rinsing the mouth and brushing teeth after drinking milk is recommended.

3. Fat Accumulation

Metabolism slows down during sleep. Drinking whole milk before bedtime may lead to fat accumulation, and long-term consumption may cause obesity. Individuals aiming for weight loss should opt for skim milk.

4. Increased Gastrointestinal Burden

Evening activity levels decrease, metabolism slows, and gastrointestinal motility declines. Drinking milk before bedtime may increase the burden on the gastrointestinal tract, causing discomfort such as bloating. Individuals with weak gastrointestinal function should be cautious about drinking milk before sleep.

5. Allergic Reactions

Some individuals are allergic to lactose or proteins in milk. Drinking milk before bedtime may trigger allergic reactions such as skin itching and difficulty breathing. These individuals should avoid milk or consume it cautiously under medical guidance.

After drinking milk, it is essential to clean the mouth thoroughly to prevent dental caries. Additionally, adjust drinking habits according to individual constitution; those with sensitive digestion should be cautious.

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