It would be terrible to lose weight while pregnant if you were very thin. I had a few extra pounds that vanished while pregnant. It was right after I started eating low carb. I also did HIIT running barefoot uphill for the first 2 trimesters. It was fun except for the shin splints. But I couldn’t eat carbs, it grossed me out.
Interesting Article:
By Tamzyn Murphy Campbell
BSc, BSc Med(Hons) Human Nutrition and Dietetics, RD
Did you know that human newborns and exclusively breastfed babies are in ketosis? 1 I am a dietitian, with two years of intensive postgraduate training in nutrition, and I didn’t realise this until just over a month ago. The fact that human babies are naturally in ketosis is an inconvenient truth because it implies that ketosis (which also occurs when fasting or eating a low-carbohydrate, high-fat diet) is not only a natural metabolic state for human infants, but that it’s probably beneficial too. Nature seldom does something without a reason, so it’s likely that ketosis may confer some kind of evolutionary advantage to human infants. Research suggests that it may be one of the main factors behind the development of the large human brain. 2
1 Cunnane SC, Crawford MA. Survival of the fattest: Fat babies were the key to evolution of the large human brain. Comp Bioch Phys. 2003;Part A 136:17-26
2 Cunnane, 2003