What Is Bile? The Liver Fluid That Digests Fat and Carries Out Waste

Bile is a fluid your liver makes every day. It digests the fat in your food, helps you absorb certain vitamins, and gives your liver a way to send waste out of the body. Dr. Jarod Ward puts it at the center of digestion, and the research backs him up.

Your liver makes bile, and your gallbladder holds it until you eat

Here is how Dr. Jarod explains the route:

"The liver is very important for digestion, and then it makes bile, and then sends the bile to be stored in the gallbladder, and then the bile is released to help process food and assimilate food."

The physiology matches. Bile is formed by your liver cells and travels through a network of tiny channels into the bile ducts, then on to the gallbladder, the common bile duct and the intestine. It is mostly water: only about 5 percent of bile is dissolved material.

Between meals, bile collects in the gallbladder, which concentrates it so the volume stays small. When you eat, a gut hormone called cholecystokinin is the major signal that empties the gallbladder, so a fresh dose of bile meets your meal in the small intestine.

Without bile, fat and fat-soluble vitamins have a hard time getting in

Fat and water don't mix, and your gut lining is a watery place. Bile solves that. Bile acids leave the liver packed into tiny clusters called mixed micelles, along with phospholipids and cholesterol, and their detergent-like structure lets fats and vitamins from your food get absorbed.

One review of bile acid physiology puts it plainly: bile acid micelles "markedly increase the absorption of fatty acids and monoglycerides, as well as fat-soluble vitamins." Your liver is also where several of those vitamins end up stored, which we cover in Which Vitamins Does the Liver Store?

This is why bile matters even if you never think about your gallbladder. A meal with olive oil, eggs or salmon only does its job if the fat in it actually gets absorbed, and bile is the step that makes that possible.

Your body recycles about 95 percent of its bile acids

Your liver doesn't make a fresh batch of bile acids for every meal. About 95 percent of them are reabsorbed in the last stretch of the small intestine and carried back to the liver through the portal vein. Researchers estimate about 3 grams get recycled several times a day. This loop is called enterohepatic circulation.

The small share that isn't reabsorbed matters too. About half a gram of bile acids made from cholesterol leaves in stool each day, and that is one of the ways the body gets rid of cholesterol. More on that in The Liver and Cholesterol.

Bile is also the liver's exit route for waste

Bile does more than digest food. Researchers describe bile acids as key to "biliary secretion of lipids, toxic metabolites, and xenobiotics." Xenobiotics are substances foreign to the body, like drugs and environmental chemicals. Once your liver has processed them, bile is one of the ways they leave.

Bilirubin, the yellow pigment in bile, takes the same exit. Liver cells pull it from the blood, tag it, and push it into bile. That tagging step is the same kind of work described in Phase 1 and Phase 2 Liver Detox.

Hormones use this route as well. Researchers who studied estrogen in people found that estrogens are excreted in bile and also travel the enterohepatic loop: in the gut, some of those packaged estrogens can be unpacked and absorbed again. So the same bile flow that digests your lunch is part of how your body keeps hormones moving out. That connection is the subject of How Your Liver Shapes Your Hormones.

Dr. Jarod watches for bile that backs up and turns sludgy

Because bile does so many jobs, Dr. Jarod pays attention to how well it flows:

"Sometimes the liver gets backed up and sludgy, and then the bile doesn't flow as well."

He connects that directly to how well you take in your food:

"We have a lot of people who have sludgy bile, which is from a malfunctioning or not ideally functioning liver, and so that's going to impact digestive absorption."

That's a big part of why his cleanse focuses on giving the liver less to clear and more to work with. As he sees it, a liver that isn't spending its day fighting off what comes in has more room for its everyday jobs, bile included. If you're wondering what those first days feel like, read What to Expect on a Liver Cleanse.

The full plan comes with the cleanse

Love Your Liver is Dr. Jarod's 21-day guided liver cleanse, and it's self-paced. The full meal plan, supplement schedule, shopping list and daily texts come with the cleanse. Your supplements ship to your door, and Day 1 starts the moment you tap start.

Prefer to start with a conversation? Dr. Jarod runs functional medicine and lab testing at Crown Chiropractic in Fort Myers. Call (239) 441-2275 to book a consultation.

Sources

• Dr. Jarod Ward, Crown Chiropractic. Liver episode on YouTube, 3:01 to 4:38.
• Boyer JL. Bile formation and secretion. Comprehensive Physiology 2013;3(3):1035-1078.
• Shaffer EA. Review article: control of gall-bladder motor function. Alimentary Pharmacology & Therapeutics 2000;14 Suppl 2:2-8.
• Gonzalez FJ. Nuclear receptor control of enterohepatic circulation. Comprehensive Physiology 2012;2(4):2811-2828.
• Chiang JY. Bile acid metabolism and signaling. Comprehensive Physiology 2013;3(3):1191-1212.
• Adlercreutz H, Martin F. Biliary excretion and intestinal metabolism of progesterone and estrogens in man. Journal of Steroid Biochemistry 1980;13(2):231-244.
• Kamisako T, et al. Recent advances in bilirubin metabolism research. Journal of Gastroenterology 2000;35(9):659-664.