I agree with all thats been said and we dont allow Allegra to have an junk, sugar or salt in her food, which is all prepared by me. She does have some thing occasionally like custard but not often, I mainly give her organic natural yoghurt and things like that.
In saying this, I have also seen 2 invididual families who were far too strict with their kids and when they went out their kids were feral and so greedy when anything slightly bad was put on the table. I remember at my birthday party as a kid my little cousins would go ballistic over cake as they were never allowed any at all and it was just awful. Another cousin was never allowed anything either and now at 14 he acts like a street dog sniffing for scraps whenever he goes to a friends house for dinner. You do need a bit of balance.
Also, when we were in Italy and staying in my FIL small villiage I never saw any child who was overwight. All the kids played together and ate so well. All the food was locally produced and prepared to maximise their goodness. Mono-unsaturated fats in the form of olive oil was a staple in their daily diet. I think the difference between here and places like that is that they ONLY eat what is in season as its at its peak. Here you can buy everything out of season, imported and grown in green houses and much of the stuff loses its nutritional value. Its also interesting to note that there are really no take away stores in Italy (beside Pizza and excluding the high tourist towns) as Italians find it a fate worse than death to eat takeout. In fact McDonalds in Calabria (southern italy) closed down because of lack of business!
A relative of mine works for McDonalds head office and she said to me, please dont ever give Allegra junk food - straight from the horses mouth I say!!