Is fatigue more due to lifestyle choices rather than genetics?

I agree . We have fatigue due to our choices, and we also have fatigue when we decide to go beyond our body limitation to achieve a temporal goal without thinking a permanent negative result on our daily living.

I agree with you, if we make the right choices, adopt a healthier lifestyle we can feel better.

Fatigue is all due to lack of the right kind of nutrients in one's body

I think that's a person to person basis. FItigue does have many factors. Underlying conditions being one of the many causes. But, asking someone to adopt a lifestyle change isn't always easy and needs to be done on their own terms. The human body can reject anything, include a lifestyle change effort. For me, I've started to sleep a bit better more recently, by going to bed around the same time as my husband. He still gets out of bed well before me, but I've gotten to where I can drift off for another hour or so and be perfectly fine. I of course make sure George makes it safely to the couch before I try. But for years I'd gotten myself turned around and that worked out fine because I worked at night mostly. Rarely got day shift. But I'm getting back to where I sleep at night. It's different for everyone and if changes can be made that person needs to be the one to make them. And for each person that lifestyle change might be different.

In my case I try to get some exercise daily to keep my mind sharp to work behind a desk.

I agree to you point .

I've experienced that myself, so I can't help but agree. I strive for a balanced diet and occasionally take magnesium. Many people have vitamin and mineral deficiencies and don't know it.