I mean some reliable source
Here’s a study done on rats that shows that BDNF and Nuerogenesis is increased by fasting
https://link.springer.com/article/10.1385/JMN:15:2:99
On a side note, No matter what mainstream “science” sais, dry fasting is one of the most beneficial things you can do for your health and wellbeing on all aspects. Like almost every other industry money and greed have a strong clutch on the mainstream scientific, pharmacutical, psychology and medical community. You will see alot of opposition to the benefits of fasting and similar practices because there is no money in Dry fasting and there is no money in healing people. There is a lot of money in keeping people not fully healed but alive enough to keep buying expensive, side affect ridden pharmacutical pills and treatments.
I hate sources
fasting and meat fruit diet is the most important thing to develop your brain. If you combine them with exercise, even an ordinary person can become a genius.
The brain is the fastest growing organ.