Note that as a general rule it’s easier to err on the low side, and if your blood glucose goes a bit high you can take more insulin later if needed. That’s OK. If instead you overdose and get low sugar that is potentially far more dangerous. You’ll also have to quickly eat or drink more carbohydrates, and that obviously reduces the effect of the low-carb diet.
“Despite its temporary side effects, we have always suspected that the ketogenic diet is relatively safe long term, and we now have proof,” says senior investigator Eric Kossoff, M.D., a pediatric neurologist and director of the ketogenic diet program at Hopkins Children’s. “Our study should help put to rest some of the nagging doubts about the long-term safety of the ketogenic diet,” he adds. 
It is completely wrong to discuss “average lifespan”. The average lifespans of pre-industrial peoples is heavily reduced by infant and early childhood mortality, which has nothing to do with lack of fresh fruit. Once you remove this bias in the numbers, pre-industrials can have lifespans almost as long as ours. And usually without many of the degenerative diseases that bother our middle and old ages.
The keto diet may also be beneficial for adults with epilepsy, though the Epilepsy Foundation notes that it’s less frequently recommended for this group because it is so restrictive and difficult to stick with. (1) One study, published in May 2016 in the journal Epilepsy & Behavior, found the diet reduced the frequency of seizures for many study participants, 7 percent of whom were seizure-free at the four-year mark. (2) And though it wasn’t the goal for this study, nearly 20 percent of the participants lost weight while following the diet. 
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