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Richard Karn says maintaining a healthy weight is a "conscious effort."

The " Home Improvement " star lost 30 pounds last year, and while he told Fox News Digital that maintaining a "perfect" weight is a "recipe for disaster," he is learning to listen to his body.

"Once you do it long enough, you realize what you need and what you don't need and what triggers you to be munching on something when you don't need to be munching on something," he said.

He told Fox News Digital he’s learned not to eat after six or seven at night very often, to not wait too long to eat because then he’ll get "very hungry" and eat too much, "and, you know, being married for 40 years is a long time to have that question, you know, ‘What do you

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