Women who drink tea or coffee during pregnancy are more likely to have young children, research suggests. Even women who…
Women who drink tea or coffee during pregnancy are more likely to have young children, research suggests.
Even women who drink less than the “safe” cutoff of 200mg caffeine – about two cups of instant coffee or three cups of tea – risk having low birth weight or premature newborns.
The researchers at University College Dublin believe that caffeine limits blood flow to the placenta, which affects the children’s growth.
Drink tea or coffee, even less than two to three cups a day, during pregnancy can lead to a smaller baby, found researchers from Dublin University  The study, by Dr. Ling-Wei Chen, looked at 941 grandfather couples born in Ireland. Tea was the main source of caffeine (48 percent), followed by coffee (38 percent).
The results suggested that for every further 100 mg caffeine – about half a cup of coffee is consumed daily during the first trimester, birth weight was reduced by 72 kg.
This amount of caffeine also reduced the length and the circumference of the children, as well as their gestation period, which measures the duration of pregnancy.
The result also found that women who consumed most caffeine had children weighing about 0.17 kg (170g) less than those who had the least.
Even women who received less than the “safe” amount of 200 mg caffeine saw significant effects. This amount is considered to be safe by NHS.
The study was published in The American Journal of Clinical Nutrition.
Dr. Chen told Reuters: “Because of the consistent associations we observed, and because many pregnancies are not planned, we recommend that women who are pregnant or trying to conceive limit their intake of caffeine-free coffee and tea
Women who consume sick drinks while IVF has reduced their chance of getting pregnant, was suggested in October 2017.
Drinking more than one sugary drink a day reduces the woman’s chance of having a living birth after IVF by 16 percent, a study by Harvard University.
Only one sugary drink one day reduces the chance of succeeding IVF by 12 percent, adds research.
Ill drinks also reduce the number and maturity of a woman’s ovarian cells, as well as lowering their amount of embryos of high quality, found the study.
Previous research suggests that sugar stimulates release of stress hormones that affect the health of the reproductive system.
Eggs and embryos may also fail to thrive in high blood glucose environments.
The researchers analyzed 340 women who underwent IVF between 2014 and 2016.
Study participants were examined during the second stage of IVF treatment, called ovarian stimulation, when the goal is to harvest as many mature eggs as possible from ovaries.
They supplemented a questionnaire to assess their drinking consumption.
The participant’s IVF results were determined by their medical records.
No connection was found between coffee, caffeinated drinks or diet soda and a woman’s IVF prospect.
“High caffeine intake can result in limited blood flow in the placenta, which can subsequently affect the growth of the fetus.”
“Caffeine can also easily pass the placenta and because caffeine clearance slows when pregnancy progresses, caffeine accumulation can occur in fetal tissues.”
The researchers worry that people do not know how much caffeine their tea contains.
Tea has less caffeine than a cup of coffee, but the exact amount depends on brewing time, water temperature and type of tea.
The Department of Nutritional Services reports that a cup of black tea contains somewhere between 23 and 110 mg of caffeine.
The World Health Organization recommends Women consume less than 300 mg of caffeine a day during pregnancy. While the NHS and American College of Obstetricians and Gynecologists do not recommend more than 200 mg.
However, the latest survey indicates that this is too high, according to Dr. De-Kun Li, a researcher at the Kaiser Permanent Northern California Research Department in Oakland.
He was not involved in study n, but found a connection between caffeine consumption during pregnancy and miscarriage in a study in 2015.
“Epidemiological findings based on self-reported caffeine consumption are usually not very precise. Thus, any cutoffs chosen by ACOG and WHO can only be considered as gross reference points, says Dr. Li.
& # 39; Biologically it is unlikely that 300 mg is risky while 299 mg is safe. The message to women I prefer would be “the less the better”.
“My advice would try to reduce as much as you can, if you can completely stop it would get even better.”
ACOG added that it reviews all its recommendations every 18-18 months, contains all new research in its reviews and makes adjustments to recommendations as needed.
In 2008, a trial of 1,063 pregnant women in San Francisco showed that those who consume at least 200mg of caffeine each day have a 25 percent risk of miscarriage compared to a 12 percent risk for those who avoid stimulation, which is also in soft drink and chocolate.
Another study showed caffeine consumption during pregnancy seems to promote childhood fatness.