Eating too much raw garlic is easy to burn, consume blood, affect vision and stimulate gastrointestinal tract. Therefore, people suffering from gastritis, gastric ulcer, duodenal ulcer, nephritis, heart disease and constipation should not eat more. Because garlic has a strong lethality, it can kill both intestinal pathogenic bacteria and beneficial bacteria, resulting in vitamin B2 deficiency and prone to skin diseases such as angular stomatitis, glossitis and cheilitis. Therefore, experts suggest that it is more scientific to eat 3-4 cloves of garlic every day, but it is not advisable to eat it on an empty stomach or take it with honey.