Fresh blueberries have a laxative effect, so don't eat them when you have diarrhea. Blueberries contain oxalate, which is harmful to patients with untreated kidney or gallbladder.

Blueberries are cool. If the stomach is bad, especially those with cold stomach, try to eat less, and those with hyperacidity are not suitable for eating blueberries.

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10 reasons to eat blueberries.

1, enhancing immunity. Studies have found that blueberries contain more antioxidants than other fresh fruits and vegetables. Antioxidants can neutralize free radicals in the body and strengthen the immune system.

2. improve your brain power. Dried blueberries as snacks can improve brain vitality. A new study found that flavonoids rich in blueberries can alleviate memory loss in the elderly.

3. Protect your eyesight. Studies have found that eating blueberries can reduce the risk of age-related macular degeneration by 38%.

4. It is good for heart health. Blueberries contain ingredients that can help blood vessels dilate, thus reducing the risk of thrombosis and heart disease. Studies have found that eating more than five servings of blueberries a week can reduce the risk of heart disease.

5, lower blood sugar. Eating blueberries helps diabetics to regulate their blood sugar levels. Eating 5 servings of low glycemic index fruits such as blueberries every week for two months can significantly improve the ability of blood sugar regulation.

6. Prevent cancer. Anthocyanins in blueberries can inhibit the growth of tumor cells, and eating half a cup a day can achieve anti-cancer effect.

7. Prevent cystitis. Some components in blueberries can prevent bacteria from adhering to the bladder wall and prevent cystitis and urinary tract infection. Studies have found that eating 1 handful of blueberries every day is helpful to improve the situation of urinary tract infection.

8, prevention and treatment of constipation. 1 cup of fresh blueberries contains about 4g of dietary fiber, accounting for 14% of the daily intake of dietary fiber. The water-soluble dietary fiber in blueberries can promote intestinal peristalsis and prevent constipation.

9. Strong bones. Blueberries are rich in trace element manganese, which plays a key role in bone development. The study found that children who like blueberries have higher bone density than those who don't.

10, reduce stomach. The polyphenols rich in blueberries can decompose abdominal fat and help control weight. In addition, blueberries are low in calories and will not cause obesity.

Methods of selecting high-quality blueberries

1, look at the surface

There is a layer of white fog on the surface of blueberries, which is said to exist only in unpolluted blueberries. So don't worry about the upper level, just choose directly.

2. Look at this color

The dark purple ones are all better, and the light ones can only show that they are not mature yet. So choose dark blueberries, which are more mature, sweeter and more nutritious.

Step 3 look at the size

The big ones are farmed, and the small ones may be wild. Nowadays, there are few wild blueberries. Big blueberries taste much better than small blueberries and have the same nutritional value.

Step 4 look at the epidermis

Blueberries will have small depressions after being left for a long time, that is, rotten pits.

5. Look directly at the production date.

In order to ensure freshness, boxed blueberries generally have a production date, so simply look at the production date directly, and the earlier the purchase date, the better.

Three groups of people are most suitable for eating blueberries.

1, children and computers. Anthocyanin in blueberry fruit has a good health care effect on eyes, which can promote the synthesis of rhodopsin on retina, reduce eye fatigue and improve night vision ability, which is incomparable to many drugs.

2. Office workers and the elderly. Anthocyanins in blueberries can fight cancer, reduce heart disease, prevent brain aging and enhance human immunity. Blueberries also contain quite a lot of potassium, which can help maintain body fluid balance, normal blood pressure and heart function.

3. Love beautiful women. Blueberry contains a lot of anthocyanins, which can prevent the early formation of skin wrinkles and is the most effective antioxidant in nature at present. Long-term consumption of anthocyanins will help prevent wrinkles from the inside out and make the skin smooth and elastic.

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