Possible Negative Effects of Eating Sweet Potatoes Too Often
Excessive Vitamin A Input: Sweet potatoes are very rich in beta-carotene, which the body converts into Vitamin A. This condition can lead to symptoms such as nausea, dizziness, headaches, and in severe cases, damage to the liver.

Imbalance in Nutrient Intake: Relying heavily on sweet potatoes for breakfast could cause to an imbalance in nutrient intake. While sweet potatoes are rich in certain vitamins and minerals, they lack others, such as protein.

Potential Weight Gain: Sweet potatoes are relatively rich in carbohydrates. If eaten in large quantities without mixing with other foods, this could lead to weight gain, especially if blended with a diet high in calories.

Oxalates: Sweet potatoes consist of oxalates, which, in large amounts, can lead to kidney stone formation, particularly in people who are predisposed to this condition.

Conclusion:
Consuming sweet potatoes regularly for breakfast can provide many health benefits, such as enhanced digestion, better skin health, and improved immunity. However, eating them too much could lead to an imbalance in nutrients and potential negative effects like excessive Vitamin A intake and weight gain.