Happy tummy, happy bum-y!

“He knows when he eats well, he poops well. So he knows, as a little kid, that when he doesn’t eat right, his poo changes,” Silverstone, 42, tells PEOPLE. “He’ll be like, ‘Mommy, it’s not coming out!’ So he’s learned through his bodyand the way he feels.”

“He’ll know when he’s starting to get a little sniffly because the kids around him at school are sniffly, and he’ll say, ‘I think I need to eat more vegetables, Mommy,’ ” she adds. “He’s such a healthy boy. When he does get the sniffles or gets a little cough, he’s still running up the wall.”

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Earlier this month, Silverstone was the keynote speaker atGood Housekeeping’s #RaiseTheGreenBarsustainability summit at Hearst Tower in New York City, where she toldPage Sixthat Bear has only complained about feeling under the weather“two times in his life.”

Alicia Silverstone/Instagram

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Alicia Silverstone and son Bear

Silverstone — who raises Bear with exChristopher Jarecki— has been a vegan for over two decades aftergiving up meatat the age of 21. She has been a passionate advocate for it since, even becoming a vegan cookbook author.

Bear has also embraced the lifestyle. In a video for the nonprofit Farm Sanctuary’s Compassionate Meals program back in May 2017, Bear said hisfavorite thing about being a veganis “that you don’t have to eat yucky meat.”

“He thinks it’s icky, and he did have a problem when he was a little younger with people eating it in front of him because he was seeing a dead animal in front of him and it made him really sad, but I think he’s gotten used to it because his dad eats meat,” Silverstone says.

“He used to come home and be like, ‘Mom! You should seewhat the kids eat at schoolevery day!’ and he would tell me what they were eating and would be like, ‘It is not healthy!’ It was so cute,” she adds. “He really understands.”

Back in 2012, Silverstone made headlines when she posted a video of herself chewing up food and feeding it directly into Bear’s mouth from her own. “It’s his favorite … and mine. He literally crawls across the room to attack my mouth if I’m eating,” she said at the time.

But even as some havecriticized the idea of feeding children a vegan diet, Silverstone has staunchly defended her family’s lifestyle. “[Bear] lovesthe foodI give him,” she told PEOPLE in 2014. “He’s not being deprived of anything. For him, having amazing fruit is like candy!”

source: people.com