What do estrogen, progesterone, testosterone, cortisol, insulin, thyroid hormones, and melatonin actually do, and how do they work together?

In this lesson from my Rhythm & Flow course, I provide a practical overview of the body's major hormones and their essential roles in mood, energy, metabolism, stress, sleep, reproduction, and overall health.

You'll learn:

What the major hormones do and how they communicate

Why the menstrual cycle is considered the "fifth vital sign"

The four phases of the menstrual cycle and the physical and emotional changes that often accompany each phase

How hormones change throughout life—from puberty to the reproductive years, perimenopause, and menopause

How to begin recognizing your own hormonal patterns

Rather than thinking about hormones in isolation, this lecture introduces a systems-based framework for understanding how hormones interact and why symptoms often occur in patterns.

This video is one lesson from my comprehensive online course, Rhythm & Flow.

If you'd like to dive deeper into hormones, metabolism, menstrual health, perimenopause, nutrition, lifestyle medicine, and the root causes of hormonal imbalance, you can learn more here:

https://goodmood.thrivecart.com/rhythm-and-flow/

The course includes 10 modules and over 50 lessons covering:

Hormone foundations

Menstrual cycles and circadian rhythms

PMS, PMDD, PCOS, endometriosis, fibroids, and fertility

Perimenopause and menopause

Hormone replacement therapy (HRT)

Blood sugar, insulin, thyroid health, stress, sleep, inflammation, and gut health

Nutrition, supplements, herbal medicine, and lifestyle interventions

A downloadable workbook and integration tools

I'm Dr. Talia Marcheggiani, a naturopathic doctor and registered psychotherapist. I create evidence-informed educational resources to help people better understand hormones, metabolism, mental health, and whole-person health.

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In this lecture, Dr. Talia Marcheggiani, Naturopathic Doctor and Registered Psychotherapist, introduces hormone testing as one part of understanding hormonal health, while emphasizing that symptoms, history, and lived experience are more important than lab values alone. She explains that testing is meant to support care, not replace clinical context.

Dr. Talia describes hormones as signalling molecules that communicate between organs and act through receptors, feedback loops, and endocrine axes such as the HPT, HPA, and HPO systems.

The lecture focuses mainly on reproductive hormones, including estrogen, progesterone, testosterone, and cortisol, and how they relate to mood, sleep, stress, fertility, and metabolism.

A major topic is the timing of testing in the menstrual cycle. Dr. Talia explains the follicular, ovulatory, luteal, and menstrual phases and why days 3 and about 7 days after ovulation are key times for bloodwork. She notes that progesterone is best assessed in the mid-luteal phase and that cycle regularity and ovulation matter more than relying on a fixed calendar day.

The lecture reviews the main hormones individually. Estrogen is described as important for the uterine lining, skin, mood, libido, and long-term brain, bone, cardiovascular, and metabolic health. Progesterone is presented as calming, sleep-supportive, and protective against estrogen’s growth effects.

Testosterone is discussed in relation to libido, motivation, muscle, and androgen excess patterns such as acne, hair loss, and insulin resistance. Cortisol is covered as a circadian stress hormone that affects immune and metabolic regulation.

Dr. Talia also explains what testing can and cannot show. Blood testing can help assess ovulation, rule out other causes of symptoms, and guide treatment, including hormone replacement therapy safety. She contrasts serum testing with saliva and Dutch urine testing, stating a preference for serum because it is standardized and more clinically useful.

We close by reviewing patterns seen in conditions such as PCOS/PMOS, perimenopause, menopause, PMS, and PMDD, and by stressing that hormone care should also consider gut function, liver clearance, methylation, nutrition, sleep, stress, and insulin.

Join the 5-Part Decode Your Bloodwork Free course here: https://goodmood.thrivecart.com/decode-your-bloodwork/

For more on hormone health, join Rhythm & Flow: The Integrative Hormone Mastery Course. Learn more here: https://goodmood.thrivecart.com/rhythm-and-flow/

Dr. Talia Marcheggiani, an Ontario naturopathic doctor and registered psychotherapist, explores the complexities of thyroid function in a five-part series on understanding blood work.

She emphasizes that thyroid health cannot be assessed through TSH levels alone, sharing her own experiences with hypothyroidism to illustrate the gap between lab results and patient symptoms.

Dr. Talia details the thyroid's roles in metabolism and hormonal regulation, the significance of the HPT axis, and the need for comprehensive testing beyond standard metrics. The session also covers the prevalence of autoimmune conditions such as Hashimoto’s thyroiditis and discusses factors that influence thyroid hormone conversion. She stresses the importance of individualized treatment approaches and the connection between gut health and thyroid function, encouraging patients to be proactive in managing their health through informed discussions with healthcare providers.

0:05 Introduction to Thyroid Labs

2:29 Importance of Comprehensive Testing

5:16 Understanding Thyroid Function

9:46 Hypothyroidism Explained

16:20 Hyperthyroidism Overview

19:54 Testing and Blood Work Insights

21:25 Interpreting Thyroid Panels

29:02 Autoimmunity and Thyroid Health

30:36 Role of T4 and T3

35:30 Conversion and Metabolism

41:28 Addressing Autoimmune Factors

48:54 Nutritional Support for Thyroid Health

52:30 Retesting and Monitoring Thyroid Levels

56:11 Conclusion and Next Steps

Learn more: taliand.com

Sign up for the full free Bloodwork Course at goodmood.thrivecart.com/decode-your-bloodwork/