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Tom Arnold looks amazing, and for good reason.

Since he and his wife welcomed their son, Jax, last April, the actor has lost 89 pounds.

"Something inside of me changed," he told People. "I knew I needed to live as long as I could. . . . The moment I saw [Jax], I realized he deserves the best."

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Before losing the weight, Arnold, 54, weighed as much as 287 lbs. and battled depression and overeating.

In addition to drinking 15 diet sodas per day, the actor, who is 6'2?, told the magazine that he'd eat a six-egg omelet with cheese, sausage and oatmeal for breakfast and an extra-large meat pizza for dinner.

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"There was a lot of shame," he said of that time.

Now that he's cut out bread and cake - and added cardio, circuit-training and abdominal workouts - he's able to play more with his little boy.

"I have tons more energy," he said.