We've replaced the need for energy by way of fuel in the source of food by using food as our entertainment and social hours and yes I do think the food industry realizes this and is using any means of advertising as a way to increase sales.
Look for signs and divert before you go into full burnout.
Pay attention to your visceral reaction to people and situations
Read and stay tuned in.
Have a fun hobby away from work
Monitor your time and be ok with saying no!
Everyone has different capacities and tolerances
If over exercising begins to impact ones life negatively then it's something to fine tune
We are all wired differently
One of my clients works out for four hours a day! Excessive? Maybe, but he's wired to move like that!
If you are training these individuals I would get medical clearance (hopefully you already have) to be sure there isn't an underlying issue causing the fatigue.
Generally if a person begins exercising in their 60's they can expect to feel a certain amount of discomfort
Stay within your scope o...