Anyone who maintains an aquarium know that caring for fish involves paying attention to what's called fish stress. Small details such as water, tank size, and temperature all contribute to the health of the fish. If even one thing is off too much, or everything is off a little, the fish are said to be "stressed" and will die. People should take care of themselves the same way. Incidentally, studies show that people who keep fish in aquariums have lowered stress levels, particularly when looking at their aquariums.
Stress reduction is important and meditation will help. If we meditate regularly it will also help prevent stress from building up in the first place.