Starting fasting

[mike_sweden]

I will try not eating after 18.00

theory, late eating means poor sleep, poor sleep gives low testosterone

[cn7]

poor theory 

[BoneBroth]

On the contrary! Intermittent fasting (when done the right way, leaving the intestines empty in the night) is confirmed to have many health benefits, of which the probably most important is to give the intestine time to heal. I do it almost every day now! It is also thought to increase growth hormone (anti inflammatory). Some benefits:

Weight and body fat loss
Increased fat burning
Lowered blood insulin and sugar levels
Possibly reversal of type 2 diabetes
Possibly improved mental clarity and concentration
Possibly increased energy
Possibly increased growth hormone, at least in the short term
Possibly an improved blood cholesterol profile
Possibly longer life
Possibly activation of cellular cleansing by stimulating autophagy
Possibly reduction of inflammation

Source: https://www.dietdoctor.com/intermittent-fasting

One drawback might be increased cortisol due to hunger feelings, but that might be corrected by drinking more water and going to bed more early.

[drop247]

This study shows it significantly reducing Testosterone.

https://translational-medicine.biomedcentral.com/articles/10.1186/s12967-016-1044-0

That said I think you will find benefits to your digestive system which could be very helpful for POIS. Keep us posted with your results.

[BoneBroth]

In that study the the caloric intake of the fasting group was divided into three meals consumed at 1 p.m., 4 p.m., and 8 p.m (the remaining 16 h per 24-h period made up the fasting period.). However, I dont know where the researches got the idea of that meals should be eaten as late as 8 p.m. Thats not how you do an "intermittent fasting"! 8 p.m. is way to late! 4 p.m. should have been the last meal! The 8 p.m. meal will still burden your intestines during the whole night (when the body needs the energy to do repair) and that fast will therefore not be of much benefit for your intestines.

Other studies show that fasting (intermittent or not) increases testosterone: "In non-obese men, an intermittent fasting testosterone study showed that fasting increased LH (luteinizing hormone ? a testosterone precursor hormone) up to 67% and overall testosterone 180%."

https://pubmed.ncbi.nlm.nih.gov/1548337/
https://pubmed.ncbi.nlm.nih.gov/2686332/