How can I teach my kid healthy eating and exercise habits?

Its not very difficult. Make it a habit since the time the kids start having solids to ensure that they have nutritious meals and snacks, which would include all food groups. Don't give in to their demands. Don't store junk in the fridge. As they start growing older, tell them about the benefits of healthy eating, don't lecture them though. Take them to the market and buy fruits and vegetables with them. Encourage them to play out every evening. Make a no gadget rule in the evening. Enroll them in any sport of their choice. Good habits once inculcated will remain for life..