Well internet is full of parenting advice so here it won't be full of any crap that you keep on reading on different of blogs. You're here to know what is right and if something goes wrong you must smell it at your earliest.
Motivate your kid rather demotivate him by scolding for un necessary reason remember that punishments can never help? Every heard that punishments have made the mistake not repeated in future. well most of the time they do get repeated so the best thing is to make things realize and this is when your wisdom plays the crucial role.
A care is what everyone like, so maintaining health comes solely under the family head who should look after what his/her kids are eating outside the home and what should they really be eating when they are at home. Direct child marketing from Fast food chains has already attracted and made many of the kids fat with unhealthy kids meal and their amusing offers. So giving them meal regularly at home is what is most important. !
And the next thing to notice is the timing schedule which is the most vital part and a sign of weakness if not followed correctly