What is the best way to eat healthier without getting fat?

work out, eat greens and low calories food, and drink only water.

this is the most common and most beneficial method.

You would have to work out eat vegetables and meat of course but you cant cut out all sugars and stuff you would have to be reasonable with what you put in your mouth so lets say if you wanted to go back for a second plate drink water instead  (fasting is never an option )

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise