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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 men, 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 male sex hormones, libido and sperm health. Occasionally Cold PFP men generally feel warm and energetic but have pain issues in the groin that are 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 within 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 that restrict the fertility of Hot and Cold PFPs, and there are two variations to these imbalances. Knowing which one 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 is less of an issue nowadays due to lifestyle changes like central heating. Sitting on cold surfaces for too long can encourage cold to “penetrate” into the lower abdomen and contract the tissues in the base of the penis and testes. Many of us have experienced severe cold with frozen shoulders, hands or feet and know how it alters bodily function and can cause pain.

The pain of Full Cold is severe and contracting, and it can affect the penis, testes, upper thigh or lower back. Because cold contracts fluids, it can also cause erectile issues and low libido. This isn’t experienced that often, but cold surfaces, poor circulation in the lower abdomen or too much cold food and drink make it more likely.

“Empty Cold”

Empty Cold is more subtle, as it develops when the body isn’t warm enough, so it’s usually a gradual, non-specific change in temperature until a point arrives when the relative lack of warmth and vitality becomes noticeable. The lack of warmth is usually most noticeable at rest or when over-tired.

Empty Cold is the issue affecting most Cold PFP men 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 sperm quality, being too cold causes problems with semen and sperm too.

Temperature affects the fluids in the glands that produce the bulk of the semen, and what may appear to be slight changes in their makeup can significantly impact male fertility. However, the main thing Cold PFP men usually notice is lower libido and sexual function, and while the metabolism and hormone balance are closely linked, there are many possible causes of Empty Cold:

  1. Low pituitary or thyroid hormone levels
  2. Too much cold food and drinks
  3. A lack of exercise and activity to raise metabolism

Cold PFP and Male Fertility

As far as conceiving is concerned, being too cold can cause a range of male fertility issues, including:

  • Low libido and mood
  • Abnormal sperm shapes
  • Low sperm numbers
  • Poor sperm motility
  • Low testosterone levels
  • Lower backache

Morefertile and Cold PFP Men

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. Clear dietary advice and recipes
  4. Lifestyle changes to help fluids
  5. Discounts on supplements
  6. 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