Podcast: Play in new window | Download
Summary
On episode 221 of 40+ Fitness, Coach Allan sits down with Kristin Kirkpatrick, an award-winning dietitian and manager of wellness nutrition services at the Cleveland Clinic Wellness Institute, to discuss her book Skinny Liver, co-written with Dr. Ibrahim Hanouneh.
Kristin explains why the liver, which she calls the body's director rather than a lead actor, touches nearly every other organ system, and why non-alcoholic fatty liver disease is now the most common liver disorder, including in children.
The conversation covers how to catch liver trouble early through blood work, why sugar and fructose specifically overload the liver, and where glutathione supplementation fits in.
Links
- https://kristinkirkpatrick.com
Key Takeaways
- The liver is the only organ that can regenerate itself. Unlike other organs, the liver can rebuild and repair, including in living organ donations, which means early-stage liver damage from lifestyle causes like non-alcoholic fatty liver disease can often be reversed if caught in time.
- The liver affects the whole body, starting with the brain. The liver converts poisonous ammonia (a byproduct of protein metabolism) into urea for excretion. When liver function is impaired, ammonia builds up and can cause anything from mental fog to coma, which is why elevated liver enzymes are checked when unexplained confusion appears.
- Fatty liver disease progresses in stages, from fat droplets to full organ failure. It starts as fat accumulation in the liver (non-alcoholic fatty liver disease), can progress to inflammation and scarring (NASH), then to fibrosis and cirrhosis, at which point a liver transplant may be the only option.
- Routine blood work is the first line of detection. Elevated ALT or AST liver enzymes on a standard metabolic panel are usually the first sign, especially in people who are obese, diabetic, or both. From there a liver ultrasound, and if needed a biopsy, confirms the diagnosis, which is why getting an annual physical matters.
- Sugar, especially fructose, is uniquely hard on the liver. The liver is the only organ that metabolizes fructose. High fructose corn syrup and soda in particular are linked to fatty liver disease, including a rising number of cases diagnosed in children who drink a lot of soda.
- Excess fructose drives insulin resistance and worse blood markers. Overloading the liver with fructose is linked to increased insulin resistance, higher triglycerides, higher LDL, higher blood pressure, and more free radical production, independent of body weight; this can happen even in people who aren't overweight.
- Alcohol isn't the only threat to the liver. Many people assume they're safe because they don't drink heavily, but sugar metabolism in the liver closely parallels alcohol metabolism. Kristin cites Dr. Robert Lustig's line that sugar is “alcohol without the buzz” in terms of its impact on the liver.
- Glutathione supplementation can support a stressed liver. People with non-alcoholic fatty liver disease often have lower glutathione and higher oxidative stress. Kristin has no objection to supplementing with it from a reputable source, unlike some herbal supplements that can actually harm the liver.
“Sugar is alcohol without the buzz.”
Dr. Robert Lustig, quoted by Kristin Kirkpatrick