But also note: "Our study showed that an IKD [intermittent ketogenic diet] can prevent the accumulation of senescent cells induced by sustained KD [ketogenic diet] ... suggesting that an IKD may be more beneficial than a long-term continuous KD"
Personally when lossing weight I've mainly done 2-3 month stints of keto followed by calorie counting. Its worked well when ive stuck to it.