The benefits are weight loss, improved outcomes for / prevention of cardiovascular disease, diabetes, metabolic syndrome, PCOS, Alzheimer's, acne, cancer, ALS, and improved HDL levels.
The risks are muscle cramps (supplement with potassium), bad breath (Gum? A mint? A quick gargle with mouth wash?), changes in bowel habits (never trust a keto fart), keto-flu (goes away in two or three weeks, sooner if you've fat adapted before), loss of energy (debatable and depends heavily on the individual).
Let's just go off of the main reason people follow ketogenic diets; they're obese or overweight, and need to lose weight to improve health outcomes.
Click here and scroll down to "Complications". You tell me if higher risk of heart disease and strokes, high blood pressure and abnormal cholesterol levels, type 2 diabetes, insulin resistance, cancer of the uterus, cervix, endometrium, ovary, breast, colon, rectum, esophagus, liver, gallbladder, pancreas, kidney and prostate, heartburn, gallbladder disease and liver problems, infertility and irregular periods in women, erectile dysfunction in men, sleep apnea, osteoarthritis, lower quality of life (depression, disability, sexual problems, shame and guilt, social isolation, lower work achievement)... is it worth it yet?
... nah, better not, might get muscle cramps.
