Episode Details

Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients.

Dr. Warrick Bishop on Sugar, Fish, and Fasting: What the Latest Research Shows

Dr. Warrick Bishop, a cardiologist, author, keynote speaker, and CEO of the Healthy Heart Network, hosts this solo episode focused on helping listeners live as well and as long as possible. He examines three commonly held health beliefs — that sugar-free drinks are safe, that more fish is always better, and that intermittent fasting is universally beneficial — and challenges each with recent research findings.

Key Takeaways:

• Sugar-sweetened beverages are widely consumed and provide very little satiety while carrying a high metabolic load, making them a significant health concern.
• Fructose, commonly added to fizzy drinks and confectionary mixes, is particularly harmful because it is processed almost entirely in the liver, where it drives fat production and accumulation.
• Excess fructose consumption is a leading driver of fatty liver disease (MASLD), which can progress to liver cirrhosis and has overtaken alcohol and hepatitis as a primary cause.
• Sugar-free drinks are not a safe alternative — they appear to negatively affect the gut microbiome and carry their own independent metabolic risks.
• Plain water is recommended as the best beverage choice to avoid both sugar and artificial sweetener-related risks.
• Large fish accumulate higher levels of mercury due to ocean toxin exposure, and Europeans now recommend limiting consumption of these fish to no more than two to three times per week.
• Chelation therapy may be worth exploring for individuals concerned about heavy metal exposure from fish, old paint, leaded petrol, or aging pipes.
• A study on time-restricted eating found that when total calorie intake remained unchanged, there was no significant metabolic improvement, suggesting calorie reduction may be a key driver of its benefits.
• Timing matters with intermittent fasting — loading all calories into a late-night meal reduces post-meal activity and limits the opportunity for metabolic benefit.
• In practice, time-restricted eating naturally tends to reduce overall calorie intake, which may explain the benefits observed outside of controlled study conditions.