In the trend of pursuing health, many people regard fruit tea as "flavored water", believing that its hydrating effect is equivalent to ordinary drinking water and more nutritious than water. This cognition is significantly wrong. This article compares and analyzes the essential differences between fruit tea and water through scientific data.
Regulate the osmotic pressure inside and outside cells: human cells live in extracellular fluid, and the osmotic pressure of intracellular fluid and extracellular fluid needs to remain relatively stable. Water is the main component of intracellular and extracellular fluids. Through the flow of water in and out, cells can maintain normal morphology and function. For example, red blood cells can maintain a normal biconcave disc shape in an isotonic solution, thereby effectively transporting oxygen; if the osmotic pressure of the extracellular fluid increases, the water in the cell will flow out, causing the cell to shrink and affecting its normal function.
Replenish water loss: The human body loses water through many ways every day, such as water vapor exhaled during breathing, water evaporated from the skin (insensible water loss), urination, defecation, etc. Generally speaking, an adult loses about 850 ml of water insensibly through the skin and breathing, about 1000-2000 ml of water in urine, and about 150 ml of water in feces every day. Only by taking in enough water every day can we replenish the lost water and maintain the body's water balance.
Participate in material transportation: Water is a good solvent for various substances in the body. Nutrients (such as glucose, amino acids, fatty acids, etc.) and metabolic waste (such as urea, carbon dioxide, etc.) need to be dissolved in water before they can be transported to various parts of the body through blood circulation. For example, water accounts for more than 90% of the blood. It is like a "transporter" that transports oxygen and nutrients to cells and transports away metabolic waste produced by cells.
As a chemical reaction medium: Many biochemical reactions in the human body need to be carried out in aqueous solutions, and water is an important medium for these reactions. For example, digestive enzymes can only play a catalytic role in water to break down food into small molecules; various metabolic pathways in cells, such as glycolysis and the tricarboxylic acid cycle, also require the participation of water.
Heat dissipation: When the human body is in a high-temperature environment or performs strenuous exercise, the body temperature will rise. At this time, the body will dissipate heat by sweating, and the evaporation of sweat will take away a lot of heat, thereby lowering the body temperature. For example, in the hot summer, the amount of sweating in the human body will increase significantly, and each evaporation of 1 ml of sweat can take away 2.43 kilojoules of heat. If there is not enough water intake, sweating will be restricted, and the body temperature regulation function will be affected, which can easily lead to heat stroke such as heat stroke.
Maintain constant body temperature: Water has a large specific heat capacity and can absorb and release a large amount of heat with small temperature changes. Therefore, water in the human body can play a role in buffering changes in body temperature and keeping the body temperature relatively constant. For example, when the external environment temperature is low, the water in the body can store heat and reduce heat loss; when the external environment temperature is high, the water can absorb excess heat and prevent the body temperature from being too high.
|
Ingredients |
Purified water |
Typical fruit tea (sugar-free) |
Tea with candy (full sugar) |
|
Core substance |
H₂O |
H₂O+tea polyphenols+fruit ingredients |
H₂O+sugar+additives |
|
Osmotic pressure |
0 mOsm/L |
150-250 mOsm/L |
300-450 mOsm/L |
|
pH |
Neutral 7.0 |
Acidic3.5-5.5 |
Acidic3.0-4.0 |
Harvard Medical School study confirms that the gastric emptying time of tea with candy (40-60 minutes) is 2-3 times longer than that of pure water (10-20 minutes). The concentration of organic acid (citric acid/malic acid) in fruit tea reaches 0.5-2g/250ml. Continuous drinking will change the pH environment of the mouth.
|
People |
Fruit tea limit |
Best time |
Must replenish water |
|
Healthy adults |
≤500ml |
10:00-15:00 |
1500ml+ |
|
Diabetic patients |
≤200ml |
Drink with meals |
1800ml+ |
|
Children (6-12 years old) |
≤150ml |
After lunch |
1000ml+ |
Vitamin supplement: 1 cup of citrus fruit tea ≈ 50% of the daily VC requirement
Phytonutrients: Blueberry fruit tea contains 120mg/cup of anthocyanins (antioxidant capacity is 50 times that of VE)
Flavor incentive: Increase the average daily water intake by 300ml (for people who don’t like to drink water)
Sugar trap: the sugar content of a certain brand of peach fruit tea is ≈ 9 sugar cubes
Acidic erosion: pH value 3.5-4.5 (long-term drinking increases the risk of enamel loss)
Calorie accumulation: 2 cups of fruit tea per day ≈ 18,000 more calories per month
|
Time |
Recommended drinks |
Scientific basis |
|
Morning |
Warm water |
Promote intestinal peristalsis |
|
After exercise |
Electrolyte water |
Quickly replenish sodium and potassium loss |
|
Afternoon tea |
Low-sugar tea |
Relieve fatigue and avoid a sudden increase in blood sugar |
|
Before bedtime |
Caffeine-free flower and fruit tea |
Does not affect sleep quality |
According to the latest research in the Journal of the American Medical Association: People who use fruit tea instead of water for a long time have an 18% higher risk of type 2 diabetes and a 23% higher risk of obesity, but scientific drinking (≤3 times/week + adequate hydration) can increase the dietary diversity score by 42%.
A: Laboratory testing shows that even fruit teas using sugar substitutes still contain 8-12g of natural fructose from the base fruit (such as mango and lychee) per 100ml. Be especially wary of vendors using "concentrated apple juice" and other added sugar substitutes, as these are still free sugars. Metabolic truth: The liver converts fructose into triglycerides 18 times more efficiently than glucose.
A: Physiological studies have confirmed that when the osmotic pressure of a beverage exceeds 200mOsm/L (typical fruit tea is 350-500mOsm/L), it delays gastric emptying and reduces hydration efficiency. Authoritative recommendations: Pure water should make up ≥60% of your daily water intake, and fruit tea intake should be limited to 800ml.
A: Compared to hot brewing, cold brewing at 4°C can reduce the dissolution rate of acidic substances by 30%, reducing tooth enamel erosion. However, it should be noted that low temperatures reduce the extraction rate of polyphenols by 40%, and Listeria monocytogenes in unsterilized fruit raw materials can still reproduce in a cold environment.
Summary: Fruit tea can be used as a flavor supplement for water, but it should not exceed 1/3 of the daily liquid intake. The best practice is to drink a glass of warm water first thing in the morning, drink water as the main drink during the day, and enjoy fruit tea as a "healthy dessert" in moderation. There are no bad drinks, only unreasonable ways of drinking.
