If you are going to do something, you must do it to the end. In order not to be so boring, it is also necessary to involve the family in the national cause of improving one's body. Although children do not need to be taught this especially, until a certain age they are very fond of healthy and tasty food. Yes, but then on the shoulders of the parents the burden of responsibility falls on the limitation, or better, the complete absence, of stupid food in the diet of their child.
But I'm not talking about that now, every parent will figure it out on his own. Here's what I mean - if the husband needed to be taught to drink healthy juice, then just tell the child "carrot juice" - the child immediately laughs, smiles, and pulls his hands. And that is great! I will try to maintain and strengthen such a useful and healthy craving!