I started a thread about this earlier in Pregnancy as the news article unsettled me and made me feel very guilty for being overweight.
I am 13+4 weeks and I have had to eat each hour to keep the nausea at bay and haven't always been able to manage healthy foods and so have put on 7 lbs.
I put on about 1 1/2 stone before getting pg and was a size 14-16, before that I was a size 12 for over 2 years due to severe anxiety and panic (I couldn't work for over a year because of it). Previously to the anxiety I was a size 14 which is a natural size for me (and yes that is eating sensibly), and I was only able to maintain a size 12 by being too ill to eat.
I can't help that I am one of those women that isn't naturally slim and I would have to work incredibley hard to be a smaller size (a size 10 would be impossible for me).
I have inherited big boobs and big hips, and as documented by health professionals, these attributes usually come along with a bigger tummy too (I tick that box also). Thanks to the media's constant focus on women's size/weight/looks I have been aware I am "big" since I was about 11 and I have hated my body since then and will probably always do so.
I have lost weight and gained weight at various times in my life and I can never remember eating and not feeling guilty. I know I am rambling, but my point is pregnancy is stressful, tiring and not an easy thing to go through without having even more guilt thrown at you. NICE are trying to do the right thing, but the media have ruined most women's self esteem already and so the message of these guidelines is not going to get through properly.
I truly, truly wish I could be slim and toned and the perfect bmi (mine is 27ish at the mo), but it won't ever happen, I have tried for years and to be honest I'm sick of hearing about it all, I'm sick of the pressure.
So no, yanbu op, it's the constant drip, drip, drip of criticism that makes us want to tell these people to piss off and let us get on with life our own way (and I don't mean by troughing pizza every night).
Sorry for the essay and for not being very eloquent.