I had dealt with depression and severe bouts of fatigue over a number of years. Over time I learnt how do deal with it but last season I upped the ante with my training and it all fell apart. I was couch bound with no energy that only made my depression worse. I was always so tiredI went to several doctors who did endless tests and found nothing conclusive. I saw a nutritionist to see if that helped and she suggested send a stool sample off for parasite and gut flora analysis.

Turns out I had a parasite in my gut with symptoms of fatigue and depression and my gut flora bacteria was way out with hight streptococcus which you guessed it fatigue and depression. I tried the herbal cleanse for the parasite to no effect and then went on to antibiotics and immediately felt better but found out last week I still have the parasite. Maybe just weakened it's grip it had on me? Anyway back training, full of energy and life id beautiful. My doctor is sending me to a gastroenterologist to get rid of the parasite once and for all. I am also treating the high strep and low ecoli.

Parasites such as dientamoeba fragils like I have can also cause issues like irritable bowel and no idea but maybe linked to food issues? Do some googling. Hope it helps...

I have zero personal experience of this, but I've heard a few second-hand accounts and also read a fair bit of research on adverse reactions to the food groups you mention and finding improvements by following a low-FODMAP diet. As the poster above briefly mentions, these are more commonly associated with GI issues, IBS and low-energy rather than depression but it might be worth a look?

e.g. http://www.mysportscience.com/...-prevent-GI-problems

Do a goggle search of the GAPS diet - it's a challenging diet/lifestyle but it's very anti inflammatory. Be prepared - no sugar, no dairy, no grain.

A lot of families with autistic kids use it to regulate behaviour.

We use it in support of our son and the effects have been very positive- better mood, clarity, focus. Weight loss (it's keto like), better recovery, better sleep.

No question there is a huge link between our psychology and what we put in our bodies.

I suffered from debilitating fatigue for years, as in sleeping 16-20 hours per day. I was also overweight and unhealthy. I went to many doctors, took every legal Upper and downer imaginable with no solution in sight... and then I changed my diet and started exercising. It's been a long road but I think food is an often overlooked cause of many of the health issues we are facing today. You mentioned it's become fashionable to blame various food groups today... I would posit the opposite, we have actually gone the other way and people are now ridiculing the idea. The best advice I can give is to try some sort of elimination diet for 30 days. Track how you look, feel, and perform and then SLOWLY add one thing back at a time. My wife has some thyroid issues and stumbled across something called AIP (autoimmune paleo). That's worth looking into as it removes the typical things like grains, dairy, etc but also nightshades and other things most people wouldn't think of as causing problems. We discovered that my wife has major issues with tomatoes and surprisingly neither of us can tolerate rice! It's worth a shot for 30 days and you might be amazed at the power of food to heal.

I've had huge success with low-FODMAP. It's the only thing that's actually let me get and keep weight off, and increased performance. Calorie counting and restriction did nothing, for all the "thermodynamics LOL" talk around here.

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The point is, ladies and gentleman, that speed, for lack of a better word, is good. Speed is right, Speed works. Speed clarifies, cuts through, and captures the essence of the evolutionary spirit.

If you respond well to low fodmap it's likely you have a microbiome problem. Might be worth getting that checked out like the above have.