Hi there.
When I was expecting twins, I followed Dr. Sears "The Zone" nutritional program, and gained within the normal amount expected, and lost it rapidly as well. Be sure to use the Omega Rx as well.
Articles here:
http://drsears.com/SearchResults/tabid/331/Default.aspx?Search=pregnantFetal & Childhood Development:
http://drsears.com/ChronicDisorders/FetalandChildhoodDevelopment/tabid/404/Default.aspxWith regard to not limiting salt and using only natural salts, I agree with the article based on the research of the late Dr. Batmanghelidj, which I also followed during my pregnancy and had low blood pressure to which the doctors and nurses were pleasantly surprised:
http://www.watercure.com/~ Ayesha