I don't usually post on threads which begin like the OPs, but I'm doing so now on order to dispel any idea that she is me!
Not my style to take on another persona, and I profoundly disagree with her views, anyway....while understanding the impact of any discussion of the health effects of formula feeding on any mother that's been disappointed with the way her breastfeeding went (people who decided to ff from the start are less bothered, in my experience).
I take issue with people who say things like 'you can discount anything you read about obesity and intelligence and asthma, because all that has been shown to be rubbish'....and then post links which absolutely do not show this at all. It is hard to isolate one particular factor - breastfeeding - in a child's life and link it to phenomena we know are multi-factorial (obesity, intelligence, allergy) and in some cases linked with socio-economic issues.
There is a great deal of research linking those things with the way a child has been fed. It is not a direct cause and effect, however. Moreover, different research throws different light on the topics - it now appears that the presence of a gene in 9 out of 10 people may allow them to profit from the IQ-boosting effect of bf, and in 1 in 10 cases the gene is not present. This has not been accounted for in all studies.
Work goes on.
Talking about the risks of formula feeding does not mean that people who use formula are dooming their kids to a lifetime of obesity, sickess and stupidity....it's highly irritating the way people dramatise the whole thing like this! The impact in any individual case is impossible to judge anyway - just as you cannot have any idea on how much your individual risk of being run over by a bus is affected by you stepping into the road without looking (I am not equating ff with stepping into the road...this is an analogy for statistical purposes only). It will depend on whether a bus is there, how quickly the driver reacts, whether you hear the bus and take evasive action. You cannot predict any of this.
Breastfeeding is the normal, physiological way for infants to feed, and for mothers to nurture. It is not possible for breastfeeding to do anything other than support the normal, physiological growth and development of the human species. Anything else - like formula feeding - is an intervention into this process and it will have consequences.
Society needs to do its best to make the normal easy to do and to ensure that individuals who are not able/willing to do it are given good information and quality substitutes.