19.04.2015

Fasting when trying to conceive

Intermittent fasting (IF) is currently one of the world’s most popular health and fitness trends. Intermittent fasting (IF) is a term for an eating pattern that cycles between periods of fasting and eating.
It does not say anything about which foods you should eat, but rather when you should eat them. Common intermittent fasting methods involve daily 16 hour fasts, or fasting for 24 hours, twice per week.
When you think about it, our hunter-gatherer ancestors didn’t have supermarkets, refrigerators or food available year-round.
Bottom Line: Intermittent fasting (IF) is a term for an eating pattern that cycles between periods of fasting and eating. Intermittent fasting has been very popular for many years and several different methods have been used.
Eat-Stop-Eat: This involves fasting for 24 hours, once or twice a week, for example by not eating from dinner one day until dinner the next day.
There is more detailed information on the different protocols here: 6 Intermittent Fasting Methods.
These changes in hormone levels, cell function and gene expression are responsible for the health benefits of intermittent fasting.
By making you eat fewer meals, intermittent fasting can lead to an automatic reduction in calorie intake.


Because of these changes in hormones, short-term fasting may actually increase your metabolic rate by 3.6-14% (14, 15). By helping you eat less (fewer calories in) and helping you burn more (more calories out), intermittent fasting causes weight loss by changing both sides of the calorie equation.
There is also one study showing that intermittent fasting causes less muscle loss than the more standard method of continuous calorie restriction (16). Bottom Line: Intermittent fasting may boost metabolism slightly, while helping you eat fewer calories.
Weight Loss: As mentioned above, intermittent fasting can help you lose weight and belly fat, without having to consciously restrict calories (1, 13). Insulin resistance: Intermittent fasting can reduce insulin resistance, lowering blood sugar by 3-6% and fasting insulin levels by 20-31% (1). Heart Health: Intermittent fasting may reduce LDL cholesterol, blood triglycerides, inflammatory markers, blood sugar and insulin resistance. Cancer: Animal studies suggest that intermittent fasting may help prevent cancer (22, 23, 24, 25). Brain Health: Intermittent fasting increases a brain hormone called BDNF, and may aid the growth of new nerve cells (26, 27, 28).
If you do intermittent fasting, this gets easier because you don’t need to plan, cook or clean up after as many meals as before.
Bottom Line: One of the major benefits of intermittent fasting is that it makes healthy eating simpler.


If you are underweight, or have a history of eating disorders, then you should not do intermittent fasting without consulting with a health professional first. There is some evidence that intermittent fasting may not be as beneficial for women, as it is for men. Although there are no human studies on this, studies in rats have shown that intermittent fasting can make female rats emaciated, masculinized, infertile and cause them to miss cycles (34, 35). There are plenty of anecdotal reports from women who became amenorrheic (their menstrual period stopped) when they started doing IF, then went back to normal when they stopped doing it.
If you have a medical condition, then you should consult with your doctor before trying intermittent fasting. There is no need to follow a structured intermittent fasting plan to derive at least some of the benefits.
If you feel good when fasting and find it to be a sustainable way of eating, then it can be a very powerful tool to lose weight and improve health. However, keep in mind that some supplements (like fat-soluble vitamins) may work better when taken with meals.
One study shows that intermittent fasting causes less muscle loss than regular calorie restriction (16).



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