I don't - my mother, who was obese, stashed food for herself when I was younger. That practice has left a very bad taste in my mouth for some reason even into adulthood. I think the message I came to understand was that I wasn't important enough to share food with, although looking back my mom used food for comfort and always wanted to make sure it was there when she needed comforted. I prefer, as others have mentioned, to teach my four children to ask permission for treats. They do know that fruits and vegetables are limitless and that they can make themselves a sandwich or a bowl of soup for lunch, but they must ask permission for special treats. Children can also be taught to be courteous in sharing food. They can be taught to ask themselves, "has Mommy and Daddy had a piece of this pie yet? My family enjoys sharing a quart of ice cream together, occasionally, much more than alone.
The only exception would be my oldest son - who is now 21 and also overweight. He would go to his father's house and his grandmother would feed then send him home loaded with twinkies, ding dongs and a horde of other high fat, high sugar foods for him alone. I, unfortunately, stepped in too late to break them of that habit and to this day when he comes to visit he complains loudly of how we have no good, processed foods in the house. I am worried about his health, but he doesn't seem to care and he's a big boy now. I wish I would have insisted on better eating habits when he was younger, but that's one of the trials of a child living between two homes with different values and practices. My youngest three are fit, athletic, and can independently prepare a simple healthy meal.
Food is a surprisingly emotional subject for lots of folks, isn't it? It must be a combination a values, preference, socio economoic, and cultural influence. Families are so different in this area.
Aside from my own childhood neurosis concerning sharing of food, my husband buys and takes things to work with him to enjoy there. I don't see that being different than taking your Alpha-Bits on a business trip, outta sight, outta mind.
