How many walnuts should be eaten a day? Scientific advice and health guidance

As a nutrient-rich nut, walnuts are good for health when eaten in moderation, but excessive amounts may cause problems such as excess calories. According to nutritional recommendations, the daily intake of walnuts for adults should be controlled within4-6 pieces (about 20-30 grams), can provide high-quality fat, protein and trace elements. Special groups (such as pregnant women, children) need to be adjusted as appropriate. This article will focus on the nutritional value, appropriate intake, overdose risks and purchasing suggestions of walnuts to help readers eat them scientifically.

Nutritional value and daily recommended amount of walnuts

Walnuts are rich inUnsaturated fatty acids, plant proteins, vitamin E and minerals, especially the outstanding content of Omega-3, which is helpful for cardiovascular and cerebrovascular health. The Chinese Nutrition Society recommends that the daily intake of nuts isAbout 10 grams, equivalent to 4-5 walnuts (in shell). The U.S. Dietary Guidelines for Residents recommends consuming about 140 grams of nuts per week, with an average of 20 grams per day. Excessive consumption may lead to excess calories (approximately 654 kcal per 100 grams of walnuts). It is recommended to divide into small portions to avoid gluttony.

Differences in intake among different groups of people

Healthy adults can eat 4-6 walnuts daily;pregnant womanCan be increased to 6-8 to supplement the nutrients needed for fetal brain development;children2-3 pieces are recommended (need to be crushed to prevent choking);People with weak digestive functionOr people who are losing weight should cut it in half. Note: The thin brown outer layer of walnuts contains antioxidant substances and should not be removed deliberately. If eaten with other nuts, the total amount needs to be reduced proportionally to avoid excessive fat intake.

Potential risks of overeating

Long-term excessive consumption of walnuts may causeDiarrhea, mouth ulcers(due to high fat and phytic acid), or interfere with iodine absorption (contains a small amount of goitrogenic substances). Some people are allergic to nuts and should be cautious when trying them for the first time. It is recommended to consume it with fruit or yogurt to improve absorption rate. Among commercially available walnut products,"Six Walnuts" drink contains high sugar content, it is not suitable to replace the original fruit; give priority to unprocessed original walnuts, such as raw walnut kernels from brands such as "Three Squirrels" and "Bestore".

Scientific food advice and summary

Walnuts are a great snack option, but there are a few caveats"Appropriate amount, variety, original flavor"principles. Adding 2-3 walnuts with oatmeal or salad for breakfast can increase the nutritional density of the meal; chew 3-4 walnuts directly as a snack in the afternoon to help control appetite. It needs to be sealed and protected from light during storage to prevent grease from oxidizing. Taken together, 4-6 walnuts a day can not only meet nutritional needs, but also avoid health risks, making it an ideal supplement for a balanced diet.

References:
1. Chinese Nutrition Society’s “Dietary Guidelines for Chinese Residents (2022)”
2. United States Department of Agriculture (USDA) Food Nutrition Facts Database
3. Harvard School of Public Health’s “Nuts and Health Research Report”
4. Reference to commercially available products: Three Squirrels (original walnuts), Bestore (paper-skinned walnuts), Six Walnuts (drinks)