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System Biology


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Systems biology uses algorithms to measure body system balance in a holistic “real-life” forecast. We measure six Systems key to fertility health.​

Temperature is the core issue for Cold PFP women, who generally feel colder and are more likely to “feel the cold” than most other people. They’ll also feel tired if a lower metabolic rate than average is causing their lack of heat. This changes the balance and rhythms of the menstrual cycle and affects a woman’s fertility. Other Cold PFP women generally feel warm and energetic but have painful periods eased by warmth.

Cold PFPs are the opposite of Hot PFPs, whose fertility metabolism is set at the top end of the scale, and as mammals, we’re all relatively warm, but some of us are warmer than others. Cold PFPs are sometimes cold in specific parts of the body, or it can be a more general condition. Temperatures often vary around the body, especially across the lower back, and it’s worth feeling for temperature differences in your lower abdomen, middle and chest. The human body is designed to function within a narrow temperature range, but body temperatures vary depending on:

  • The heat generated in cells
  • Blood circulation
  • Exposure to heat and cold
  • Sex hormone levels
  • Diet
  • Exercise
  • Drugs
  • Age
  • Times of day
  • Infections and inflammation

Because the lower abdomen is where our reproductive organs are, the temperature here affects fertility the most. The effects of unusual body temperature are the main issues restricting the fertility of Hot and Cold PFPs, and there are two variations to these imbalances. Knowing which is involved is crucial when trying to increase the odds of conceiving.

Variations of Cold

It’s easiest to explain the different temperature issues using the terms “Full” and “Empty”:

  • “Full” refers to an excess (from outside) that reduces temperatures; frostbite and a frozen shoulder after exposure to cold are examples.
  • “Empty” refers to a lack of heat (always internal) that causes a relative excess of cold, and hypothyroidism is a classic example.

“Full Cold”

Full Cold is relatively simple to explain, as something from the outside is chilling the body, and frostbite is the obvious example, but infections by cold viruses are another option. They make the body chilly and create stiffness, aching, and clear mucus, while other viruses (‘flu or meningitis) are more inflammatory and produce heat symptoms of fever and yellow or green mucus.

Full Cold can directly affect a woman’s fertility, and it’s the main reason some young, fit and healthy women struggle to conceive. We all know that severe cold can affect how the body functions, as anyone who’s had a frozen shoulder or hands will know, because cold can get “lodged” in tissue, including the womb. When this happens, it affects how it functions and the nature of periods. The usual cause is because the abdomen has got chilled and not warmed up after exposure to cold.

Cold has a contracting action, and this tightens tissues and slows the flow of fluids, which can make it difficult to shift. Women with this issue affecting their womb often get stabbing, fixed period pains that is eased with warmth on the abdomen. The heat works by reducing the cold and encouraging a healthier flow of blood.

“Empty Cold”

Empty Cold is more subtle, as this variation of coldness develops gradually because the body isn’t warm enough. There’s no apparent reason, but a point arrives when the relative lack of warmth and vitality becomes noticeable, and this is usually most obvious at the end of the day or when over-tired.

Empty Cold is the issue affecting most Cold PFP women and is often due to a low metabolic rate generating too little heat and energy for body processes to work at their best. In practice, this means that most Cold PFPs also have Energy PFP issues.

Our bodies function best in a relatively narrow temperature range, and we become less dynamic if we’re cooler. Among other things, our natural interest in sex reduces, which is pretty crucial when trying to conceive! While high temperatures create inflammation and reduce egg quality, being too cold causes problems in the second half of the cycle when progesterone should dominate, and the embryo moves along the Fallopian tube and implants.

The things Cold PFP women usually notice are lower libido and longer cycles. While the metabolism and hormone balance are closely linked, there are many possible causes of Empty Cold:

  1. Low hormone levels
  2. Too much cold food and drinks
  3. Lack of exercise and activity to raise metabolism

Cold PFP and Female Fertility

Women with Cold PFP who fertility chart will often see low basal body temperatures (BBT) across the month, and they’re more likely to experience:

  • Luteal Phase Defect
  • Endometriosis
  • PCOS
  • Implantation failure
  • Miscarriage
  • Low thyroid levels
  • Lower backache and urinary frequency
  • Low mood and libido

All women with Cold PFPs should focus on raising their temperature and improving the health of their cycles and eggs. These are all possible with the right support and some determination!

Morefertile and Cold PFP Women

Premium morefertile® membership gives you access to:

  1. Your secondary PFP (if you have one) 
  2. A rating for each profile and what the combination means for you
  3. Natural treatment options for PCOS, endometriosis and more
  4. Clear dietary advice and recipes
  5. Lifestyle changes to raise energy
  6. Discounts on supplements
  7. Access to cutting-edge testing

We also outline the best ways for Cold PFPs to adjust their weight and manage stress to improve monthly conception rates. The different profiles have different challenges and needs, which is all part of the PFP discussion, along with personalised ways to improve fertility health, and the tests and treatments most likely to be appropriate for you. The morefertile approach:

  • Is informative and empowering
  • Raises general and fertility health
  • Speeds up natural conception times
  • Improves IVF success rates
  • Increases resilience and lowers stress levels