I totally endorse this.
I've been diagnosed in recent times as gluten and lactose intolerant. Gluten is a trigger food for psoriasis with me.
When it kicked in, I'd be in a bad state and tinkle poor company. Now that I've adapted my diet and focused on eating fresh fruit and veg with lean meat or fish, I'm a much happier camper and enjoying a better night's sleep - deep, vivid dreams included - that has me waking up and feeling much livelier and more positive.
A reduction in alcohol consumption - no beer or liquor consumption, moderate wine intake with meals - has played a strong role, too.
Still enjoy toking quality black hash, though. And looking forward to a good season growing marijuana again in my back yard. Had a nine-footer with fragrant buds the last time I grew one, producing a very tasty supply of lovely, gentle weed that lasted almost six years. I try not to over-consume or rely on this stuff, though. Just use it wisely on social occasions or out on the golf course or ski hills.
Or when I'm online, pounding out reams of advice and wisdom to Spurs fans.