According to Medicalnewstoday.com (2018), initial stages of the keto diet might cause fatigue and concentration difficulties due to the change in lifestyle, but over time, people who follow a long-term keto diet start to experience better clarity and focus.
A systematic review by Van Berkel et al., (2018) found that some patients with epilepsy, when started on ketogenic diet report better alertness and attention when presented with cognitive tests.
Not only have these authors asserted to the benefits of ketosis, some other , Hallböök et al., (2012) have also proven that over time, those who are on a long-term keto diet, experience enhanced cognitive function and neuroprotective effects.
They showed that long-term ketosis can influence better sleep, memory, clarity, and concentration. Another study examining the effect ketones have on mitochondrial disorders as conducted by Frey et al., (2017) showed that being on ketosis can improve mitochondria functioning.