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Wellness Dietitian Mary Condon, RN, LDN, said the keto diet may result in weight loss and lower blood sugars, but its a quick fix. More often than not, its not sustainable. Oftentimes weight gain may come back, and youll gain more than what you lost, Condon said.

Condon said you should always consult your primary care doctor before starting any new diet.
If you are on diabetic medication that causes low blood sugar, those meds may need to be adjusted within a few days, Condon said. There are heart-healthy sources of fat, however if that person is not educated on heart-healthy sources of fat, they may consume excessive amounts of saturated fats that can increase your risk of heart disease, Condon said.

The keto diet could cause low blood pressure, kidney stones, constipation, nutrient deficiencies and an increased risk of heart disease. Strict diets like keto could also cause social isolation or disordered eating. Keto is not safe for those with any conditions involving their pancreas, liver, thyroid or gallbladder.
Kleinman said someone new to the keto diet can also experience whats called the keto flu with symptoms like upset stomach, dizziness, decreased energy, and mood swings caused by your body adapting to ketosis.

https://www.uchicagomedicine.org/forefront/health-and-wellness-articles/ketogenic-diet-what-are-the-risks If you want the whole article. Just make sure you understand these risks before starting