I've just been looking at some research which was published looking at baby led weaning last month.

This study was performed on 155 children and indicates that babies which follow a baby led weaned approach appear to be more likely to develop healthier food preferences when they are older.

This makes sense to me as this weaning method allows a baby to choose the (solid) food they eat for themselves from 6 months. In the book Baby Led Weaning by Gill Rapley it explains that babies who are intolerant to certain food types will actually often naturally avoid the food in question when they are given the choice. I also find this research reassuring as my baby has been weaned on this approach but it is still not very common so I like reading all the research which backs it up.