I have heard fasting has been used throughout the ages to facilitate religious experience, but I know very little of it.

What's your opinion/experience with fasting and meditation?

I'm curious also. Early Christian  monks fasted ridiculously.  And they lived remarkably  old. But does it help reach jhana? Ora stage of poi

Until around 3-4 years ago, I would do yearly solitary retreats where i observed 8 monastic precepts, including not eating solid food after noon, hence fasting until the following morning. 

3-4 years ago as I was doing this in a retreat I developed pretty unpleasant symptoms. Long story short I developed some form of reactive hypoglycemia and am no longer able to skip a meal without those symptoms recurring. Obviously my personal bias is to see not much point in fasting. It did make me observe the craving for food and let go of it while on retreat, so it can help work on that. I'm just wondering if it's actually healthy.  But I'm open and curious to hear others' experience. Monks do follow the fasting rule above and seem to be doing ok with it. Maybe it's just a few like me that cannot do it.

Easy answer, try it and report back.
Many questions are available this way. Why not learn from doing instead of speculation?
Good luck,
​​​​​​​~D

@dreamwalker Forewarned is forearmed.

As much as I love direct empiri, fasting poses both risk and difficulty, especially if doing prolonged fasts. Most I have managed is 60 hours.
I also struggle to discern if it's done for moral reasons, or to enhance mental state.
Add in variance between individuals, and I would consider due diligence wise.
All that said, I likely will end up trying a 10-day fast with electrolyte water during retreat.

@runner1 I think consensus is cyclic fasting is good for extending lifespan. Whether it increases or decreases vitality and healthspan, I'm not sure about.

@benvipassana Man that sounds rough.
That's the weird thing about fasting, it seems some get miracle effects from it, others get run into the ground by it.
Thanks for sharing that

60 hours fasting, good, doing meditation? 
retreat following the retreat rules. Including your own. 60 hours should go to one incremental step up.
Good luck mixing them and watch out for a&p bs screwing up your rules.
​​​​​​​~D

Fasting raises dopamine and various forms of cortisol and adrenaline- whether or not that will be good for your practice is something only you can determine from trial and error.

I am unable to fast because it makes me too "high," encouraging me to go in the direction of hypomania. 

We know from various studies that meditation raises dopamine around 65% higher than baseline- add that to fasting and you might get into the territory of hallucinations, which is of course why a lot of shamanic traditions combine fasting with the other practices to induce that sort of experience.

I would be wary of it if you have a tendency towards mania but I wonder if it would be more helpful for a depressed/sluggish/kapha type person. 

It is very helpful. I use it to get results from doing about 2 - 3 hours kasina a day that I would normally get from about 6 hours.&nbsp;<br /><br />If I did a 10 day fast, all day awareness + 3 hours of meditation a day I would definitely get similiar results as a 10 day retreat would give me.<br /><br />Be careful if you have already very little body mass. I have read stories about people who were already very skinny and it often did damage.<br /><br />If your BMI (and/or bodyfat) is reasonable you should be OK.

I find that eating too much carbohydrates has a negative effect on my mind in a way that works in opposition to meditation and mindfulness. My practice is much more effective if I have a low carb diet. It's not a keto diet but still lower in carbs than a typical diet. So for some people, if they normally eat a lot of carbs, they might find their mind is clearer and their meditation practice is more effective during a fast.

When I'm on a low carb diet, in comparison to a normal diet, it seems like I naturally and easily slip into a meditative/mindful state during daily activities, and the effects, the state of mind, produced by sitting meditation are easier to maintain and last longer after the meditation session is over. I'm not as much caught up in and carried away by thinking and emotions (ie worrying about the future, rehashing the past, over reacting to present situations).

If anyone wants to try cutting back on carbs it might be helpful to know that I find the best way to cut back on calories is to eat a big meal that will keep me full for several hours and then when I get do hungry, it's not cravings that are hard to control, but more of just an awareness that I could eat but I can easily refrain from eating. I think cravings can be caused by unstable blood sugar levels so if you can wait until they stabilize you might not get cravings. Then it's much easier to start a different diet as long as the new diet doesn't destabilize blood sugar levels ie doesn't have high levels of carbs. However, I think there can also sometimes be withdrawl effects from carbs that can have a negative influence on one's mood and that can be a problem people should be aware of. This can be ameliorated by consuming more carbs if/when needed so it can require a delicate balance to maintain the low carb diet.

I tend to plan diets starting with the amount of protein I want to consume and then adjust carbs and fat to meet whatever other objectives I have for the diet (ie total calories or ratios of macronutrients). I would want to be sure I was getting enough protein to support my level of physical activity even if I was trying to reduce total calories to lose weight.

I don't know if other people will experience what I do but I think it's probable there are some who will.