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    News

    What’s That Rash?

    Get answers to the health questions everyone’s asking. Our experts give you the information you need to feel good and make the best decisions for your brain and body.

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    Copyright: © Copyright 2020, Australian Broadcasting Corporation. All Rights Reserved.

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    Latest Episodes:
    Does hypnotherapy work? Oct 07, 2026
    Show notes

    Sit back and relax. Close your eyes. Imagine you're sitting on a calm beach. Now, do you feel more open to suggestion?

    Hypnotherapy has been around for centuries, and you might've heard about it being used for everything from PTSD to addiction and even IBS.

    Norman and Tegan guide us through the evidence for using hypnosis in a therapeutic setting, and whether there are any downsides.

    References:

    • Brain Activity and Functional Connectivity Associated with Hypnosis
    • Not everyone can be hypnotized - and researchers are one step closer to understanding why
    • Functional Brain Basis of Hypnotizability
    • A Systematic Review of Hypnosis for Clinical Pain Relief
    • The effectiveness of hypnosis for pain relief: A systematic review and meta-analysis of 85 controlled experimental trials
    • Hypnosis as a non-pharmacological intervention for invasive medical procedures - A systematic review and meta-analytic update
    • Gut-directed hypnotherapy for IBS: what is it and what are the options?
    • Gut-Directed Hypnotherapy for Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis
    • Does hypnotherapy help people who are trying to stop smoking? - Cochrane Review
    • Effectiveness of hypnosis in adults with posttraumatic stress disorder (PTSD)
    • A Meta-Analysis of Hypnotherapeutic Techniques in the Treatment of PTSD Symptoms
    • Hypnotherapy in the Treatment of Chronic Combat-Related PTSD Patients Suffering From Insomnia: A Randomized, Zolpidem-Controlled Clinical Trial
    • Ericksonian hypnotherapy versus cognitive behavioral therapy for post-traumatic stress disorder
    • The Prefrontal Cortex and Suggestion: Hypnosis vs. Placebo Effects

    If you enjoyed this episode, check these out!

    • What's the deal with night terrors?
    • Can tapping calm your nervous system?
    • Why do we dream?
    NMN, NAD+ and other acronyms of anti-aging Sep 30, 2026
    Show notes

    As we age, levels of a vital molecule called nicotinamide adenine dinucleotide (NAD+) decline. Could reversing this be the key to eternal youth?

    There’s huge interest in NAD-boosting supplements like nicotinamide mononucleotide (NMN). But is there good evidence that they can help us live longer, healthier?

    Norman and Tegan unpack how NAD+ became the focus of anti-aging proponents.

    This episode first aired on November 4, 2024.

    References:

    • NAD+ metabolism and its roles in cellular processes during ageing
    • NAD+ in Brain Aging and Neurodegenerative Disorders
    • What is really known about the effects of nicotinamide riboside supplementation in humans
    • Dietary Supplementation With NAD+-Boosting Compounds in Humans: Current Knowledge and Future Directions
    • The use of a systems approach to increase NAD+ in human participants
    • Specific ablation of Nampt in adult neural stem cells recapitulates their functional defects during aging
    How bad is shift work for your health? Sep 23, 2026
    Show notes

    Shift workers make a lot of sacrifices to keep the world running. What are they sacrificing in terms of their own health?

    There are harms associated with working at all hours against your body clock.

    Norman and Tegan work through what those are, and what you can do to protect against them.

    References:

    • 5 long-term health effects of shift work
    • Shift work can harm sleep and health: What helps?
    • Coping with shift work
    • Shift work and health outcomes: an umbrella review of systematic reviews and meta-analyses of epidemiological studies
    • Shift work and long work hours and their association with chronic health conditions: A systematic review of systematic reviews with meta-analyses
    • Relationship between long-term shift work; night work; sleep deficiency and stroke: A systematic review and meta-analysis
    • Shifting Rhythms: A Systematic Review Exploring the Multifaceted Effects of Shift Work and Circadian Disruption on Employee Cardiovascular Health
    • Exercise interventions for sleep and cognitive dysfunction in shift workers: a systematic review of randomized trials

    If you enjoyed this episode, check these out!

    • What is the perfect nap duration?
    • Chronotypes: early birds vs night owls
    • Why do some people pee more often?
    Eat the rainbow: what can food colour tell us? Sep 16, 2026
    Show notes

    When you're done with your weekly grocery shop, how colourful is your trolley?

    We know eating lots of fruits and vegetables is good for you, but colour could matter.

    Norman and Tegan discuss what gives fruit and veggies their hue and whether it's important when it comes to healthy eating.

    References:

    • Phytonutrients: Paint your plate with the colours of the rainbow
    • Clinical Evidence of the Benefits of Phytonutrients in Human Healthcare
    • Eat a Rainbow – Nutrition Australia
    • Phytochemicals: Principles and Practice
    • What’s the Difference Between Sweet Potatoes and Potatoes?
    • Role of Phytonutrients in the Prevention and Treatment of Chronic Diseases: A Concrete Review
    • Major phytochemicals, their sources, active sites, and the related health benefits
    • Effect of Fruit and Vegetable Consumption on Human Health: An Update of the Literature
    • Adding variety to your diet lowers disease risk. But what does variety mean?
    • Which Colour of Bell Pepper Has Most Nutrients?

    If you enjoyed this episode, check these out!

    • Should you be eating more fruit?
    • Why Norman won't shut up about the Mediterranean diet
    • What are the health benefits of coffee?
    Mouthwash: good or bad for you? Sep 09, 2026
    Show notes

    How much time does your oral hygiene routine take? You brush, floss, interdent, maybe even use a tongue scraper.

    Is using a mouthwash going to give you any additional benefit? Or could you be doing some harm?

    Norman and Tegan answer questions about the effectiveness of mouthwash, what it does to your oral microbiome and why there might be a link to blood pressure.

    References:

    • Oral microbiome: Unveiling the fundamentals
    • Effectiveness of Mouthwashes in Managing Oral Diseases and Conditions: Do They Have a Role?
    • Effect of Adjunctive Use of Commercial Daily Mouthwashes on Periodontal Health: An Umbrella Review
    • Effect of post-brushing mouthrinse solutions on salivary fluoride retention
    • Mouthwash Effects on the Oral Microbiome: Are They Good, Bad, or Balanced?
    • Effects of chlorhexidine and a polyherbal mouthwash on the oral microbiome and user satisfaction: a randomized controlled trial
    • The Effects of Antimicrobial Mouthwashes on Systemic Disease: What Is the Evidence?
    • Oral hygiene, mouthwash usage and cardiovascular mortality during 18.8 years of follow-up
    • Does Mouthwash Use Affect Oral Cancer Risk? A Comprehensive Systematic Review and Meta-Analysis
    • An update on mouthwashes: advice for dental practitioners

    If you enjoyed this episode, check these out!

    • Can flossing benefit more than your teeth?
    • How risky is sharing a toothbrush?
    • Should you opt for aluminium-free deodorant?
    Why wear a continuous glucose monitor? Sep 02, 2026
    Show notes

    Continuous glucose monitors, or CGMs, have transformed how people with diabetes manage their blood sugar.

    But in wellness circles, more and more people without diabetes are being encouraged to try these devices.

    Norman and Tegan get to the bottom of what these devices can actually tell you, and the potential harms.

    References:

    • The wellness inspired rise of continuous glucose monitors for people without diabetes, including those with metabolic disorders – BMJ features
    • Continuous glucose monitoring in non-diabetic populations: a systematic review of observational and interventional studies with meta-analysis
    • Blood glucose monitoring devices: current consideration – Australian Prescriber
    • The Use of Continuous Glucose Monitoring to Diagnose Stage 2 Type 1 Diabetes
    • Associations of continuous glucose monitor derived time in range and glycaemic variability with diet lifestyle and demographics
    • Different Glucose Variability in Women With Polycystic Ovary Syndrome With and Without Insulin Resistance: A Pilot Study
    • Understanding the benefits and psychological burdens of using continuous glucose monitoring for lifestyle change: A mixed-methods cross-sectional study
    • Unintended Consequences: The Intersection of Diabetes Technology and Disordered Eating Risk

    If you enjoyed this episode, check these out!

    • Should we all be taking fish oil?
    • Tonsils, appendix, gallbladder: is anything actually useless?
    • Should you wait to swim after eating?
    Are rest days from exercise necessary? Aug 26, 2026
    Show notes

    Not many people would argue that rest isn’t important, but how would you define a rest day?

    For an elite athlete a rest day could be going for a long walk. For your average person it could mean sitting on the couch.

    Norman and Tegan ask – why is rest important, and do you need it to make progress in the gym?

    References:

    • 'No pain, no gain' debunked: Why post-exercise soreness is not essential for building muscle
    • Skeletal muscle and resistance exercise training; the role of protein synthesis in recovery and remodeling
    • Effects of Different Between Test Rest Intervals in Reproducibility of the 10-Repetition Maximum Load Test: A Pilot Study with Recreationally Resistance Trained Men
    • The time course for elevated muscle protein synthesis following heavy resistance exercise
    • Recovery and Performance in Sport: Consensus Statement
    • Effects of Consecutive Versus Non-consecutive Days of Resistance Training on Strength, Body Composition, and Red Blood Cells
    • Nonconsecutive versus consecutive-day resistance training in recreationally trained subjects
    • Fatigue, pain, and the recovery of neuromuscular function after consecutive days of full-body resistance exercise in trained men
    • Effects of Consecutive Days of Exercise and Recovery on Muscle Mechanical Function
    • How much is too much? (Part 1) International Olympic Committee consensus statement on load in sport and risk of injury

    If you enjoyed this episode, check these out!

    • Is retirement bad for you?
    • Do the benefits of creatine go beyond the gym?
    • Diet vs exercise: which is more important?
    What has your nose got to do with sleep? Aug 19, 2026
    Show notes

    Have you ever spritzed your pillow with lavender and wondered, is this actually doing anything?

    There are some surprising ways that smells can affect sleep, and it might have something to do with how our brains work.

    Norman and Tegan discuss how smells, good and bad, could affect your nightly snooze.

    References:

    • From antiquity to modern hygiene: the archaeological and medicinal legacy of lavender as a promising antimicrobial agent
    • Lavender and sleep: A systematic review of the evidence
    • How Smell Affects Your Sleep – Sleep Foundation
    • Reciprocal relationships between sleep and smell
    • Subjectively intense odor does not affect dream emotions during rapid eye movement sleep
    • Nocturnal exposure to a preferred ambient scent does not affect dream emotionality or post-sleep core affect valence in young adults
    • Olfactory Aversive Conditioning during Sleep Reduces Cigarette-Smoking Behavior

    If you enjoyed this episode, check these out!

    • Is farting a sign your gut microbiome is happy?
    • Is melatonin the answer to a good night's sleep?
    • Is a vibration plate worth the cost?
    Why do we cry? Aug 12, 2026
    Show notes

    Do you feel better after a good cry, or do you feel worse than ever?

    There can be a lot to cry about, good or bad: a break-up, a milestone, a tragedy, a sappy movie.

    Norman and Tegan discuss why we evolved to cry, and the purpose it serves as we get older.

    References:

    • The Riddle of Human Emotional Crying: A Challenge for Emotion Researchers
    • The neurobiology of human crying
    • Emotional expression in human and non-human great apes
    • Ultra-processed food intake, cognitive function, and dementia risk: A cross-sectional study of middle-aged and older Australian adults

    If you enjoyed this episode, check these out!

    • Butter vs margarine: what's better for you?
    • How much protein do you REALLY need?
    • Why is yawning contagious?
    What is ultra-processed food? Aug 05, 2026
    Show notes

    You might be hearing a lot about ultra-processed foods, or UPFs, and how we should all be avoiding them.

    But you might be struggling with figuring out what exactly IS an ultra-processed food. Sweetened drinks, sure. What about bread? Yoghurt?

    Norman and Tegan unpack why it isn’t a simple question, and where the evidence stands on the health consequences.

    *A previous version of this episode may have implied that the Food Standards Australia New Zealand (FSANZ) board is comprised of current food industry representatives that are directly involved in setting food policy. This was edited on 12/08/2026.

    References:

    • Ultra-Processed Foods and Human Health - The Lancet series
    • Diet quality and processed foods – Food Standards Australia and New Zealand
    • Most of the Foods We Eat Are Ultra-Processed. Are They All Unhealthy? - Johns Hopkins Bloomberg School of Public Health
    • Trends of obesity and underweight in older children and adolescents in the United States, Brazil, China, and Russia
    • Ultra-processed products are becoming dominant in the global food system
    • The UN Decade of Nutrition, the NOVA food classification and the trouble with ultra-processing
    • Ultra-processed food exposure and adverse health outcomes: umbrella review of epidemiological meta-analyses
    • Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake
    • The collapse of the food matrix: how ultra-processed foods impact satiety and metabolism by altering physical structure beyond nutrient composition

    If you enjoyed this episode, check these out!

    • Is gluten really the enemy?
    • Why is everyone suddenly talking about seed oils?
    • Why Norman won't shut up about the Mediterranean diet
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