Eating bread in moderation on a regular basis is generally not harmful, but the main hazards of improper consumption or long-term overconsumption are nutritional deficiencies, obesity, elevated blood sugar and indigestion. The specifics are as follows: 1. Although bread can satisfy hunger, eating only bread can not provide sufficient nutrition for the body. Often eating only bread will lead to malnutrition. 2. Bread contains a large amount of starch, refined sugar and preservatives, and eating bread regularly can easily lead to obesity. 3. Bread is high in sugar, which increases blood sugar levels and can lead to diabetes when eaten regularly. 4. The gluten in bread is difficult to digest, and long-term consumption of large quantities may lead to constipation and gastrointestinal disorders. In terms of diet, we should eat more fresh vegetables and fruits, and we also need to supplement quality protein appropriately to balance the nutrition and ensure the needs of the body in all aspects.