Curious to hear what worked for you.
Definition of low energy levels in this context:
* struggles to work more than 20 hours a week without spending the rest of each day and the weekend recuperating.
* does not notice any significant differences in energy levels from a healthy diet, regular exercise, and achieving a healthy BMI. (That's not to say there isn't a difference, but it's small and can result in more consistent energy flow - the overall energy level is still low and recuperation is often strongly desired, feeling of fatigue is still constant)