Neenee Jellybeanie, Actually, within 4 weeks of giving birth to DD I was lighter than before pregnancy. 1 1/2 years later I had lost 10kg without a diet. So definitely thumbs up for BFing from that perspective.
Unfortunately I then fell pregnant with DS and it hasn't worked that way this time.

When DD was 1 1/2, I flew to Germany via Dubai. I had a lovely woman from Oman sitting next to me. She was all covered up and had a 3 month old baby with her. When my daughter wanted a feed, I felt a little conscious of possibly offending this woman or making her feel uncomfortable. So I said to her that I need to feed my child and that I hope she won't be offended. She just looked at me puzzled and said: Why should I be offended? She proceeded to tell me how women in Oman BF their children for much longer than in Australia. 2 years is the norm. BFing is seen as normal. Of course they would not expose any skin while they are doing it they feed under their clothes), but she thought nothing of seeing a little of my skin. It was such a positive experience and we ended up really bonding. We chatted for hours. I then noticed other women who all of a sudden pulled babies out from under their coats.