Does a ketogenic diet have bad effects?

Yes! A long-term ketone diet can also have health effects.
Kidney stones.
Too much protein in the blood.
Mineral and vitamin deficiencies resulting from a low intake of fruits and grains.
Fat builds up in the liver.
The ketone diet can also cause side effects known as ketone flu.
Fatigue.
Low blood sugar. 
Nausea & vomiting.
Poor exercise endurance.
I was on a keto diet, but I didn't stick to it for more than two weeks. Getting into the ketone state, which shifts the body's main fuel consumption from carbohydrates to stored fat, needs a process. In the first few days of my keto diet plan, I felt my stomach was burning, the craving for carbs makes it hard for me to concentrate on my work and homework. If you have a busy schedule and study, I personally don't recommend you start a keto diet.

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