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MeMe Roth doesn't allow her children to eat any sugar on weekdays. She enforces daily exercise, and boycotts Girl Guide cookies.
Call her the "Tiger Mom" of nutrition, if you will.
"When I see a child that's already overweight at four, I'm furious," Ms. Roth, an anti-junk food activist and founder of the National Action Against Obesity, tells CNN.
The mother of two checks her children's backpacks in the mornings to ensure they have empty containers to collect whatever treats they're given. Later, she examines their contents to decide what can be eaten or thrown away.
Ms. Roth, who has fought to ban cupcakes in schools, blames parents and schools for children's poor eating habits.
"After every baseball game, soccer match, someone tries to shove a doughnut in their mouths," she says.
But can parents go overboard in enforcing healthy eating? Dietician Janine Whiteson, tells CNN yes - restricting children's diets can drive them to binge on junk food later.
Ms. Roth's children, however, appear to happily comply with their mother's nutrition rules.
"Kids hate to eat vitamins," Mason, 12, says, as he pops his daily fish oil pills. "I feel sorry for them because their parents feed them incorrect food."
Would you forbid your children from eating junk food?
Wency Leung