Introduction: Is heavy fruit consumption good or bad for glioma? Fruit has long held a reputation as a health food, and many patients after diagnosis turn immediately to fruit-and-vegetable-based regimens — reasoning that more can only help.

Is heavy fruit consumption actually good or bad for glioma patients? 

Fruit has long held a reputation as a health food, and many patients after diagnosis turn immediately to fruit-and-vegetable-based regimens, reasoning that eating more can only help. Fruit contains high concentrations of fructose — a sugar roughly twice as sweet as glucose. Humans are innately drawn to that sweetness, and it is easy to develop a habit. Many people find it hard to stop: eating half a kilogram in one sitting and still feeling it wasn't enough.

What is the harm in eating too much? 

Glucose can be utilized directly by cells throughout the body; fructose cannot. Fructose must first be processed by the liver, following a metabolic pathway that closely resembles that of alcohol. Alcohol is now widely understood to be harmful — and fructose is no different in this respect: it must be hepatically metabolized. Liver metabolism of fructose does not raise blood glucose or insulin, but it does create several downstream problems.

Problem one: Fructose is converted to fat during hepatic metabolism. Some of this fat accumulates in the liver itself, producing hepatic steatosis; the surplus is stored as adipose tissue elsewhere, promoting weight gain — which in turn promotes insulin resistance.

Problem two: Uric acid is a byproduct of the fat synthesis pathway activated by fructose metabolism. Eating large quantities of fruit pushes serum uric acid levels upward.

Problem three: Fructose metabolism generates reactive oxygen species (ROS). ROS drive oxidative reactions — in plain terms, they accelerate cellular aging — and simultaneously promote chronic inflammation. For women, there is an additional concern: ROS interact with subcutaneous collagen to form glycated proteins, directly contributing to wrinkling and a dull, sallow complexion.

Problem four: most directly relevant to glioma: A recently circulating study found that fructose metabolism produces a compound called LPC — lysophosphatidylcholine. This LPC enters systemic circulation, reaches the tumor microenvironment, and promotes cancer cell proliferation. Excessive fruit consumption is therefore not a trivial matter for glioma patients.

Does this mean fruit should be avoided entirely? 

No. The vitamins, dietary fiber, and minerals in fruit remain genuinely beneficial. The key is to avoid high-fructose varieties and instead choose cultivars with low fructose content.

How do you choose?

Sweetness is not a reliable guide. Hawthorn berry is intensely sour, yet contains 22 grams of fructose per 100 grams. Jujube and durian are even higher — exceeding 30 grams of fructose per 100 grams. The following fruits are low in fructose: blueberries, strawberries, avocado, pomelo, figs, guava, pomegranate, apricots, plums, oranges, and kiwifruit. Each of these contains less than 5 grams of fructose per 100 grams and can be eaten freely — they are genuinely beneficial to health. When reaching for fruit, choosing the right variety makes all the difference.

Reference: https://www.incsg.com/jiaozhiliu/8476.html