Health Learning Notes · Educational only
A personal video learning path through the gut, mitochondria, endocrine signalling, the nervous system and circadian rhythm.
Why this page exists
I used to see health as separate topics: food, sleep, hormones, energy, stress and training. The more I learned, the more I noticed that these systems are connected.
This page is my attempt to understand the basics in a logical order: gut, mitochondria, endocrine system, nervous system and circadian rhythm.
01 · Gut
The gut is more than digestion. These resources introduce how microbes, the gut wall, immune signalling and the nervous system interact.
How information can move between food, microbes, immune pathways, nerves and the brain.
Educational resource only. Watch the original creators and speak to a qualified professional for personal health questions.
Elaine Hsiao
Why watch Microbiome, brain, behavior and immune signalling.
Understand after watching Food, microbes, gut wall, immune system, nervous system and brain are connected.
Watch on YouTube ↗Ruairi Robertson
Why watch Strong overview of nutrition, microbiome, neurotransmitters and the gut-brain connection.
Understand after watching The gut can influence signals related to mood, appetite, immunity and brain communication.
Watch on YouTube ↗Duke University
Why watch Short and useful explanation of how the gut and brain communicate.
Understand after watching The gut and brain exchange information through neural and chemical pathways.
Watch on YouTube ↗Erika Ebbel Angle
Why watch Broad overview of the microbiome, health, food and disease context.
Understand after watching The microbiome is not a random detail. It is part of a larger biological system.
Watch on YouTube ↗02 · Mitochondria
These videos build from mitochondrial structure to cellular respiration and ATP, using accessible biological explanations.
Why energy production matters for tissue function, movement, heat and recovery.
Educational resource only. Watch the original creators and speak to a qualified professional for personal health questions.
Seeker
Why watch An introduction to mitochondria beyond the basic school phrase.
Understand after watching Structure, mitochondrial DNA, ATP and why different tissues need different amounts of mitochondria.
Watch on YouTube ↗Amoeba Sisters
Why watch Accessible explanation of how food becomes usable energy.
Understand after watching Glucose, glycolysis, Krebs cycle, electron transport chain and ATP.
Watch on YouTube ↗Crash Course Biology
Why watch A deeper explanation connecting ATP to movement and biology.
Understand after watching Energy production matters for exercise, recovery and cellular function.
Watch on YouTube ↗Crash Course Biology
Why watch Helps make ATP clear using practical examples such as training and push-ups.
Understand after watching Aerobic and anaerobic respiration both matter depending on intensity and oxygen availability.
Watch on YouTube ↗03 · Thyroid and Endocrine
This section introduces the thyroid and then expands to the wider hormone network and its feedback loops.
How glands release chemical signals and how the body regulates those signals through connected axes.
Educational resource only. Watch the original creators and speak to a qualified professional for personal health questions.
These are educational concepts only. This page does not interpret hormone levels or give personal advice.
Emma Bryce · TED-Ed
Why watch A clear starting point for understanding the thyroid.
Understand after watching T3, T4, metabolism, energy use, hyperthyroidism and hypothyroidism at a basic educational level.
Watch on YouTube ↗Amoeba Sisters
Why watch Explains the broader hormone network.
Understand after watching Hypothalamus, pituitary, thyroid, adrenals, pancreas, testes and target cells.
Watch on YouTube ↗Crash Course
Why watch Goes deeper into hormone communication, blood glucose regulation and the HPA axis.
Understand after watching Hormones are slower signals that tell target tissues what to do.
Watch on YouTube ↗Crash Course
Why watch Important for understanding the HPT axis and feedback loops.
Understand after watching Hypothalamus → pituitary → thyroid axis, negative feedback and why hormone systems are connected.
Watch on YouTube ↗04 · Nervous System and Circadian Rhythm
The final section connects neural communication, the autonomic nervous system, internal clocks and sleep.
How the brain and nerves coordinate information, body state and the sleep-wake cycle.
Educational resource only. Watch the original creators and speak to a qualified professional for personal health questions.
Crash Course Anatomy & Physiology
Why watch A good foundation for the nervous system.
Understand after watching Central and peripheral nervous systems, sensory input, motor output, neurons, glial cells, and afferent and efferent signals.
Watch on YouTube ↗Crash Course Anatomy & Physiology
Why watch Important for understanding stress, recovery and body state.
Understand after watching Sympathetic and parasympathetic systems, fight or flight, and rest and digest.
Watch on YouTube ↗Marco A. Sotomayor · TED-Ed
Why watch A useful introduction to circadian rhythm.
Understand after watching Internal biological clocks and how the body tracks time.
Watch on YouTube ↗Claudia Aguirre · TED-Ed
Why watch A strong ending video about why sleep matters.
Understand after watching Sleep loss can affect brain and body function, explained as education rather than fear.
Watch on YouTube ↗