字幕列表 影片播放 列印英文字幕 So my wife and I are at a friends wedding. We just finished dinner and a tub of vanilla ice cream is opened up in the room next door, it’s about 500 feet away. I have no idea this is happening. My wife on the other hand is completely overwhelmed by the smell of vanilla. In her words it’s assaulting her senses and I also notice, she hasn't touched her champagne. When she bolts to ladies room after feeling nauseous on the dance floor, it hits me we're going to have a baby. We had a beautiful baby girl a few months later. but ever since the wedding I wanted to find out more about why pregnant women get this super human sense of smell. And what causes those 2 a.m. pickle cravings? How does mom's diet influence the baby's favorite foods? On this Mother's Day addition of Reactions, we’ll explain these and other amazing science facts about pregnancy. Well like many things in pregnancy, the changes that a woman's, um, that occurred to a woman senses really are largely related to hormones. During pregnancy are levels of estrogen increase quite a bit and as levels of estrogen change we may note different aspects of our senses and certainly smell and taste are, are big ones. Probably two-thirds of pregnant women will report that they're very sensitive to odors. But when it comes to the science that tries to investigate this, there's not a lot about evidence for it. What may be changing as that what's the lowest concentration of an odor can detect from maybe the change in how much you like the odor. That, what was once pleasant now is unpleasant. There are a lot of hypotheses. Unfortunately, that's mostly what they are, about how these cravings occur. Leptin is secreted by our fat cells. Leptin is known to decrease our appetite and increase your metabolism. We know that that leptin changes during pregnancy. Neuropeptide Y is another substance that's out there that's considered an appetite stimulant and has been shown to rise as pregnancy continues. There is evidence that there may be heightened bitter sense taste sensitivity, especially during the first trimester. There's a whole host of hypothesis is why that maybe the case, and actually that this heightened sensitivity may be protecting the fetus. Because it's - one of the results, is mothers are eating bitter tasting foods that could contain toxins. Just like they're learning about your voice, about the language you speak, they're also learning about the foods that you eat. It's a really beautiful and elegant system that is common to all mammals, is that the first way in which we learn about foods are through these flavors they get transmitted from the diet via the bloodstream into the amniotic fluid and then mothers milk. The baby has a well-developed sensory system that can detect these flavors. The baby we'll be learning and there is research showing that if you eat these foods, your baby is at an advantage when you first offer those foods and will like them. The whole like neural and hormonal interactions for mother baby or parent baby are really quite powerful. We know that oxytocin is a chemical messenger, it's released in the brain and it's released in response to a social contact, particularly skin-to-skin contact. What it then does insights desire for further contact. So it’s part of the reason that we place a baby immediately on mommy's belly or up near her chest, we want that skin-to-skin contact to begin. High estrogen in pregnancy causes an increased throughout the pregnancy of the number of oxytocin receptors in mommy's brain. And then as oxytocin starts to surge in labor, so baby and mom here then exposed to that oxytocin and it's literally would be like trying to set them up to start craving each other. In some ways if you think too much about how all of these things work, very important for your doctor to be thinking about it, but as the person who is going through it, sometimes it's to try to recognize these are changes that happen, they’re natural, they’re important. They probably have a role, they're doing something good, but not to the point where we would become so obsessed that we miss the miracle here, because really indeed, it certainly is.