To me, the interesting thing is that across countries and cultures, there are different "recommendations" but I'm not sure they produce healthier moms or babies.  In France, where I was visiting my partner's cousin who is a midwife, the MAX weight gain recommended is 25 pounds.  Whereas that's our minimum for a normal weight woman (25-35 pounds is the US rec).  She's happy with a patient who only gains 15 pounds, and mortified by one who gains 35.  Similarly, in Japan, the weight guidelines are even less than in France.
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To me, it seems so obvious that the range of only 10 pounds for normal weight women is ridiculous (that all normal weight women should gain between 25-35 pounds). I work with 50-60 pregnant women every week for the past 10 years (prenatal yoga teacher, but I'm also trained as a doula and CBE), and in general, yoga women are healthy and mindful.  Some gain 15 pounds, some gain 45.  And both of those numbers seem healthy - babies are a good size, moms return to prepregnancy weight eventually, there are the usual aches and pains of pregnancy but nothing too serious.  obviously, this is my anecdotal experience, but i really do watch carefully, and encourage people not to beat themselves up either way for too little or too much weight gain.
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All that being said, we all know we have a problem in this country with an over-abundance of processed, crappy foods (great post Smokering!), and a resulting population that is too heavy to be healthy.  Even a "normal weight woman" that I mentioned above, based on the latest graphs and charts, might be carrying 10-15 pounds of extra weight she really doesnt need. So, continuing to be mindful about eating, and being *more* mindful when you're growing a baby, is something I really advocate for. Â
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FWIW, i've noticed that I really don't need to eat many extra calories in pregnancy (and I've gained an average amount of weight so far - 21-22 pounds in 31 weeks).  When I'm more hungry than usual, i eat more, but I exercise less intensively than i did before pregnancy, so I'm eating about the same amount. Someone above was trying to figure out the math of calories and pounds, and I've always found it can't be boiled down to a math equation!   I take comfort in knowing that unless you're really restricting yourself, baby will take what s/he needs and you'll get the rest. Â
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thanks for all the info everyone - i found it really interesting!