Is eating whole fruit or drinking juice better for people to control blood sugar?

To control blood sugar, eat whole fruits instead of drinking juice because fiber helps slow down the absorption of sugar into the blood.

Fruit is always a recommended food group in a healthy diet. However, for the goal of controlling blood sugar, eating whole fruits or drinking juice has completely opposite effects.

According to BS.CK2 Chau Thi Anh, in charge of the Department of Nutrition, Xuyen A General Hospital in Ho Chi Minh City, the core difference between these two methods lies in the fiber and plant cell wall structure. The presence or absence of these two factors directly determines the speed and manner in which sugar enters the bloodstream.

From a metabolic perspective, these are two separate processes:

Eat directly: "slow release" mechanism helps stabilize blood sugar

When eating whole fruit, natural sugars (including fructose, glucose and sucrose) are safely stored inside plant cell walls and surrounded by a dense network of fiber, especially soluble fiber such as pectin.

To release this amount of sugar, the digestive system must go through many stages from chewing and kneading in the stomach to the action of enzymes in the small intestine. Thanks to fiber, which slows down the digestion and absorption process, sugar will slowly penetrate into the blood. This helps the blood sugar index increase stably, while also creating conditions for the pancreas to secrete insulin effectively.

Drinking juice: Acute blood sugar "shock".

In contrast, the juicing process, whether using a slow juicer or a centrifugal juicer, crushes the cell structure and completely removes the protective fiber layer. The juice cup is now essentially just a solution containing water, vitamins and free sugar.

The lack of a fiber "barrier" causes natural sugar to be absorbed extremely quickly in the small intestine and poured into the blood in a short time. As a result, the blood sugar index spikes much faster than when eating whole fruit.

To handle this condition, the pancreas is forced to secrete more insulin. For people with type 2 diabetes or insulin resistance, this response can make blood sugar control more complicated and difficult.

The doctor further analyzed that to make a 250 ml glass of orange juice, people usually have to use 3-4 oranges. Continuously eating this amount of oranges is not easy because the fiber will quickly create a feeling of fullness. In contrast, a glass of juice can be consumed in just a few seconds, causing the body to accidentally ingest the sugar of many oranges at once. Therefore, the glycemic load of juice is always significantly higher than eating whole oranges.