This week Sue and Meagan are learning all about hormones and how they affect the body, and we might even talk about running!

Full Show Notes and Resources:

What are hormones?

Cortisol - stress hormone that controls your mood, motivation, and fear (known for your body’s fight or flight response), also affects how your body metabolizes food, keeps inflammation down, regulates blood pressure, and controls your body’s sleep/wake cycles, can also boost energy. Cortisol can shut down bodily functions that aren’t necessary when your body is having a crisis of some kind (like shutting down menstruation when energy supply is chronically low). Having too much cortisol in your body for too long can have serious negative effects on the body like anxiety, depression, memory problems, trouble sleeping, and weight gain.

Adrenaline - another stress hormone that is secreted in times of crisis. In response to a threat, adrenaline stimulates the heart to beat faster and harder, increases alertness, increases blood flow to the muscles, and decreases the pain response. Excessively high levels of adrenaline due to stress without actual threat of danger can cause heart damage, insomnia, and a jittery, nervous feeling.

Estrogen - Estrogen, or oestrogen, is the primary female sex hormone. It is responsible for the development and regulation of the female reproductive system and secondary sex characteristics. Estrogen also affects metabolism, hunger, and fat storage - which is why changes in estrogen throughout the menstrual cycle can affect your hunger, food intake, and weight gain. Estrogen blunts hunger, so you may feel less hungry at times in your cycle when estrogen is high, like the week before ovulation. It also plays a role in bone formation and muscle protein synthesis.

Progesterone - another female sex hormone that is involved with ovulation and pregnancy. It also affects metabolism, skin health, mood, bone strength, body temperature, inflammation and immune response. Progesterone can have a dramatic effect on mood - when progesterone levels drop before the start of the next menstrual cycle, that is when many women experience sharp changes in mood and heightened irritability (one known characteristic of PMS). Progesterone increases hunger - watch out for hunger when progesterone peaks the week after ovulation.

Testosterone - the main male sex hormone that is also present in women. It is an anabolic steroid - which means it promotes muscle growth. Testosterone usually stays pretty low in women, but we do get a small surge in testosterone around the middle of our cycle. Testosterone enhances libido, so that is something else you might notice in the days around ovulation.

Growth Hormone - stimulates growth, cell reproduction, and cell regeneration in humans - because of its ability to promote muscle growth and fat loss, it is used exogenously by bodybuilders, but it is a hormone that all humans produce naturally. Growth hormone is secreted in pulses throughout the day - with a big surge of it coming just before you wake up in the morning. Fasting and vigorous exercise both increase growth hormone, while eating food decreases it.

Erythropoietin (EPO) - is an essential hormone for red blood cell production and has been shown to dramatically improve athletic cardiovascular performance. EPO doping has been used by endurance athletes to boost performance illegally, but training at altitude can have similar effects on the body because the lower oxygen levels at altitude can boost natural EPO and red blood cell production.

Insulin - regulates blood sugar levels in the body. When you eat food, insulin is secreted to promote the storage of glucose in your liver, muscles, and fat. The glucose goes to the liver first and is stored as glycogen, and once that’s filled, goes to the muscles and again stored as glycogen, and any remaining glucose is stored in the fat cells as fat. Carbohydrates, protein, and fat all raise insulin levels in the bloo