[cahoot_bird]

Get diet, sleep, and exercise right. If any of these three are off, energy is lower. I wish I could oversell this point a little more, there has been plenty of times over the years I've done something small on days - missed an hours sleep, ate too much, sit around to long without moving -- and my energy level and performance was affected without me realizing it.

I've found the easiest and usually cheapest way to control diet is to cook at home.

Look into the Mediterranean diet, it has consistently come up when researching health. Of course the mere word diet implies temporary, but the right way of eating should perhaps be permanent.

Get a blood test done and have it analysed to determine if anything is off.

Don't get dehydrated and get kidney stones. Drink enough water throughout the day. Sometimes I carry a stainless steel container with me throughout the day so I'm getting enough. Be careful about drinking something else for example two glasses of tea and getting sweaty.

Perhaps find and add some health books to your reading list. One interesting, seemingly irrefutable argument put forth in "The China Study" though the book controversial, was no single ingredient food will give more health as much as focusing on the overall diet for most people. Two good books are "How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease" and "On Food and Cooking: The Science and Lore of the Kitchen" are two good ones.