For a normal adult 300 calories for dinner is not reasonable and is an inadequate supply of calories.
Every 100 grams of buns contain 120 calories, 300 calories is equivalent to two and a half buns. Rice can be about 230 calories for 200 grams.
60 kilograms of light manual labor adults need 1800 to 2200 calories a day, dinner accounts for 30% of the total calories throughout the day, dinner calorie intake of 540 to 660 kcal calories is more appropriate, if it is during the weight loss period can be appropriate intake on the low side.
In practice, each person should make adjustments according to his or her physiological state, living habits, physical activity level and weight, as well as the accessibility of food resources.
If long-term calorie intake is insufficient will lead to malnutrition, decreased immunity, and in severe cases, even lead to hypoglycemia and fainting. Therefore, we should not diet excessively to lose weight, and we must take enough calories in three meals a day to maintain nutritional balance.