Researchers from the Brazilian Federation of Gynecology and Obstetrics Association Commission for Endocrine Gynecology have investigated the following theories for increasing the chances of pregnancy:
1. Women are more fertile as they age – MYTH
Although a woman may feel healthy in her 40s, her fertility will not be in the same state as in her 30s, Brazilian researchers said.
They said the evidence of age that impedes fertility is not unanimous. But data shows that between 25 and 27 years of age trying to become pregnant has a success rate of around 80 percent for 12 cycles.
In contrast, the figure is closer to 50 percent for people between 40 and 45 years old.
This is according to two studies, one in 2017 under the direction of Boston University School of Public Health, published in the American Journal of Obstetrics and Gynecology, and another under the direction of Princeton University in 1986, published in Science.
2. Men are less fertile as they age – TRUE
The effect of a man's age on reproduction is less clear, according to the researchers – scientists are trying to understand the subject.
However, the Brazilian team said that there are & # 39; clear directions & # 39; are that older fathers have lesser quality sperm. That is the result of two 2018 studies, one of which was led by the University of Campinas, published in Fertility and Sterility.
Studies have shown that men younger than 25 are the most fertile and among these men, 95 percent of their sperm has no DNA damage – a figure that drops to 80 percent at the age of 35.
This was highlighted in a comprehensive review by the Center for Reproductive Medicine in Cleveland, Ohio, published in the journal Reproductive Biology and Endocrinology in 2015.
3. Women have a & # 39; fertile window & # 39; – TRUE
The authors said, although not impossible, the chances of conception being very low outside the & # 39; fertility window & # 39 ;.
They said the best chance of pregnancy is six days before the ovulation day, according to a 2002 study by the National Institute of Environmental Health Sciences. Ovulation day falls two weeks before a bleeding.
The team said having sex hoping to become pregnant even a day after that day is meaningless.
4. Lubricants kill sperm – TRUE
Lubricants can stimulate the antics of the bedroom – but they do nothing for the ability of sperm to swim, the researchers said.
& # 39; Multiple studies have shown that multiple lubricants adversely affect sperm motility at different concentrations, & # 39; according to the authors.
Sperm begins to swim slower after 15 minutes of exposure to lubricants, a 1996 study by researchers at the University of Texas Southwestern Medical Center in Dallas revealed, the findings published in a journal that has now been discontinued.
Strangely enough, mustard oil seems to work well as a lubricant, because when sperm is exposed to it, it remains hyperactive and the ability to swim is not reduced.
This is according to a study by the State University of New York Upstate Medical University in 2014, published in Fertility and Stertility.
The Brazilian researchers added that findings such as these suggest that canola, baby or mustard oil should be preferred as a lubricant because they do not have a significant impact on sperm motility.
5. Sex closer to ovulation will father a boy – MYTH
A popular belief that the Brazilian team often hears is that the gender of a baby depends on when it was made during the woman's cycle.
Sex closer to the ovulation day would increase the chance of having a boy, and sex farther away from the ovulation day would favor a girl.
But the Brazilian team claims that there is limited and controversial evidence to support this.
They said: & # 39; There are a small number of studies, most of which were conducted more than 15 years ago in small groups of patients, and with conflicting results. & # 39;
6. Diet will increase female fertility – MYTH
A woman can buy products that are & # 39; fertility enhancing & # 39; for the best chance of becoming pregnant.
But the Brazilian team said there is not enough evidence to support that diets – vegetarian, low-fat or supported with herbal supplements – will help.
Even among the most studied nutrients, vitamin D and folic acid, there is not enough robust science, the team said.
However, folic acid is important for the development of a healthy baby, and women trying to conceive should therefore take it, the NHS says.
7. Diet increases male fertility – TRUE
Men's sperm can be damaged by obesity and poor lifestyle choices, evidence is increasing.
Consuming too much alcohol, caffeine, red meat, and processed meats, sugar, and total dairy products can reduce the chances of pregnancy, the authors said, taking note of studies including one published in the Journal of Endocrinology of the University of Adelaide in 2017.
On the other hand, regular consumption of fish and seafood, poultry, grains, fruits and vegetables and low-fat dairy products can improve sperm, according to a group of studies.
8. Smoking affects fertility for men and women – TRUE
Smoking is generally unhealthy, which according to science can affect fertility.
For women there are indications that smoking reduces the chance of pregnancy and increases the chance of miscarriage and an earlier menopause.
For men, smoking can damage sperm quality up to DNA level, according to various studies, including a 2018 study by the University of Hassan II Casablanca, published in Andrologia.
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