Are Colonoscopy Preps Full of Crap? What You Need to Know

[00:00:07] Welcome to the Ask Nurse Alice podcast, the place where we talk about all things health and wellness and make the complicated stuff easier to understand. I'm Nurse Alice, family nurse practitioner, and join me for a real conversation about the things that affect our health and our lives. Now, y'all know me, I pride myself on being honest and direct with you always. So full disclosure, what we're talking about today is literally full of crap.

[00:00:38] Figuratively, literally, but clinically, it's serious business. So as I'm recording this episode right now, I'm sitting here in the middle of sipping my colonoscopy prep solution because my procedure is first thing tomorrow. Yes, I am practicing what I preach. And while nobody looks forward to a day and night of clear liquid diet or spending quality time in the bathroom all night, I'm doing so because screening saves lives.

[00:01:07] According to the data from the American Cancer Society, colorectal cancer is the second leading cause of cancer deaths overall in the United States for both men and women combined. But here's the most alarming trend we're seeing. Colorectal cancer is rising rapidly in younger adults. Now, this used to be thought of as an older person's disease, but not anymore because one, watch your mouth. Who are you calling old? And two, we've seen this play out on national stage in heartbreaking ways.

[00:01:35] We lost Chadwick Boseman, our Black Panther, at just 43 years old after a private four-year battle with colon cancer. And we saw James Van Der Beek, who so many of us grew up watching on Dawson's Creek, publicly share his stage 3 colorectal cancer diagnosis at age 46. These aren't just headlines. These are wake-up calls.

[00:01:56] Seeing vibrant, active people in their 40s face this disease is exactly why national medical guidelines drop the recommended age for average risk adults to start routine screening from age 50 down to 45. So who is actually at risk for colorectal cancer? Clinically, we break down these risk factors into two main categories, things you can't change and lifestyle factors you can control. So let's look at non-modifiable risks. These are the things you can't change.

[00:02:27] Age and average risk. National guidelines recommend that all average-risk adults begin routine screening at age 45. Personal and family medical history. If you have a first-degree relative, like a parent, child, or sibling who had colon cancer or precancerous polyps, your risk is significantly higher, and your scheduling risk should start at an even earlier age, often at 40 or 10 years younger than the relative's age diagnosis.

[00:02:53] The same applies if you have inflammatory bowel disease, like Crohn disease or ulcerative colitis. And there's racial disparities. Black American, including U.S.-born African Americans and individuals of recent African or Afro-Caribbean descent, they face 20% higher rate of diagnosis and 40% higher mortality rate compared to other racial groups. Now, let's talk about the modifiable lifestyle risk factors, the things you can control. Dietary habits.

[00:03:23] High consumptions of red meats like beef, pork, or lamb, and especially processed meats like bacon, hot dog, sausage, and deli cold cuts. There's tobacco and heavy alcohol use. Smoking combustion tobacco like cigarettes, cigars, and pipes. And heavy drinking, which we clinically define as one drink a day for women or two drinks a day for men. And physical inactivity and obesity. Sedentary lifestyles and excess body weight can directly correlate with an increased risk.

[00:03:52] The power of a colonoscopy isn't just in detecting cancer. It's the power in preventing cancer. So when the gastroenterologist goes in, if they find a precancerous polyp, they snip it out right away before it ever has a chance to be turned into cancer. It's one of the few screening tests that can stop cancer before it even starts. So why do some people avoid screening? Well, despite how effective screening is, far too many patients delay or skip it entirely.

[00:04:20] And in my practice, whenever I initiate this conversation about colorectal cancer screening with patients, I hear the same reoccurring barriers. So let's address the top three reasons people forego screening. What I commonly hear? I don't have any symptoms and nobody in my family has cancer. From a clinical standpoint, this is a dangerous misconception. Over 85% of individuals diagnosed with colorectal cancer have no family history of the disease.

[00:04:47] Precancerous polyps typically develop silently without pain, rectal bleeding, or changes in bowel habits. If we wait for clinical symptoms to manifest, such as anemia, unexplained weight loss, or persistent abdominal pain, we are no longer catching a disease in its early preventable stage. We are managing advanced pathology. A lot of people feel uncomfortable with the procedure itself. And I've had a lot of patients tell me straight up, Nurse Alice, that back door is an exit-only one-way street.

[00:05:16] I know what that is, and that's fear, pride, and truth wrapped up in humor. So I want you to think about this as a city infrastructure. Even a one-way street needs routine maintenance and inspection to keep the road safe. You can't fix a sinkhole or clear a blockage if you refuse to let the maintenance crew down the street. In medicine, the gastroenterologist and the endoscopy team are your specialized maintenance crew. They do the procedures every day, you are safely sedated, and when you wake up,

[00:05:46] the inspection is complete and you're ready to go and eat. People are apprehensive about the bowel prep. And listen, I can't blame you. I'm going through it right now. But today, clinical options have evolved. Today, we have low-volume preps, better flavor formulations, and split-dose schedules that are far easier to get down, and even a tablet-based prep regimen like Sutab that allow you to swallow pills and drink water instead of drinking that massive jugs of solution.

[00:06:15] And that brings us directly to why bowel prep itself is the clinical foundation of this entire procedure. Let's talk about how this prep works and why you can't cheat. Now, I'm drinking this, y'all. I wish I could cheat. But again, cancer screening saves lives, so I'm going to drink this. Let's talk about why we go through this and how this process actually helps from a clinical standpoint because a lot of patients ask me, Nurse Alice, why do I have to follow such a strict timeline?

[00:06:43] Can I just take a bunch of over-the-counter laxatives the night before and call it a day? And the answer is absolutely not. And here's why. An over-the-counter laxative or stool softener only stimulates the lower valve to move existing stool. It does not, I repeat, it does not perform a total deep cleansing sweep required for a colonoscopy. A colonoscopy examines your large intestine, which is a part of your lower digestive tract.

[00:07:11] That scope enters through the rectum and travels about five feet to where the colon connects with the small intestine. Now, prescription bowel preps use specialized osmotic agents, okay? These solutions work by pulling large amounts of fluid into the lumen, inside your colon, creating a high-volume fluid surge. Think of this like a power washer or heavy flood stage in a river.

[00:07:35] That osmotic fluid literally sweeps every microlayer of mucus, seed, residue, and particulate matter off the mucosal walls. A standard laxative simply can't do that. Now, to give that prep solution the best chance to work, we start with the process long before you drink the first drop. So, you got to start with a clear liquid diet. And this usually starts about 24 hours before your procedure. Why?

[00:08:02] Because solid food, even healthy food like fiber-rich vegetables, whole grains, nuts, and seeds, those take days to fully pass the GI tract. And so, if you eat solid food the day before, you're constantly adding new debris while trying to clean the pipes of the old debris. Something else. You need to drink plenty of clear liquids to stay hydrated. Clear chicken broth, beef broth, apple juice, white grape juice, black coffee and tea without milk or creamer and electrolytes.

[00:08:32] A clear liquid is anything you can literally see through when held up to the light. So, that water, apple juice, and clear broth. Dairy products and milk alternatives like almond milk or oat milk and creamers are not clear liquids. They are opaque emulsions. So, when they travel through the digestive tract, they coat the mucosal lining of your colon with thick, cloudy film that blurs the camera lens and conceals tiny, flat polyps.

[00:08:59] And also, this dairy creates a curdled residue and slow down digestion. The milk proteins and milk fats interact with the stomach acid and the osmetic prep solution, causing the dairy to curdle into small clumps in your GI tract. So, instead of being able to sweep out clean, those curdle particles linger along the colon walls, creating debris and false alarms for the gastroenterologist.

[00:09:22] So, during your prep window, no milk, no cream, no yogurt, no ice cream, and no dairy milks or creamers in your coffee. Keep it strictly transparent. Clear liquids. And then also, don't consume anything with red, purple, or blue dyes, like cherry jello or red Gatorade. Those artificial dyes can stain the mucosal lining of your colon and look identical to active bleeds or inflammation on the camera.

[00:09:51] And let's talk about the timing of things. Because typically, you begin drinking the first portion of your solution prep about 12 to 18 hours before your procedure. So, usually starting the evening before, sometime between 4 and 6 p.m. Now, my procedure is scheduled for 11 a.m. tomorrow. So, I started drinking my prep at 5 p.m. today. This gives the osmotic fluid several hours to do its primary heavy lifting and sweeping overnight.

[00:10:17] Most modern regimens use split dosing, meaning you take the second half of the solution 4 to 6 hours before your scheduled procedure. Sometimes waking up early morning to finish it. Like for me, I gotta wake up at 3 a.m. But split dosing is proven to produce a more effective, cleaner right side colon where flat, hard-to-see polyps often like to hide. Versus taking all that prep in a single night. In medicine, all of this effort comes down to one ultimate clinical goal. It's a good idea.

[00:10:46] And that's complete mucosal visualization. Your colon is about 5 feet long with dozens of hostra, which are those natural folds and turns in the gut wall. And for the gastroenterologist to do a thorough inspection, the lining of your gut needs to be completely clear of any residue stool or debris. So, the clinical target for a successful prep is what we call clear, pale, yellow, watery stool. It should look like urine or lemonade coming out.

[00:11:13] So, if it's see-through with no solid particles, your colon is prepped and ready for camera time. Now, why does it matter if someone cheats on their clear liquid diet or stops drinking their prep halfway through because they feel full? Well, because leftover stool or cloudy fluid creates blind spots. A precancerous polyp can be as tiny as a pencil eraser or completely flat against mucosal tissue.

[00:11:37] If it's covered by even a tiny smear of stool or a hidden pocket of debris, that wasn't a clean sweep and the camera misses it. And if you show up with an inadequate prep, the gastroenterologist may have to cancel or abort the procedure, meaning you went through all that hassle for nothing. You'll have to schedule and repeat the prep night all over again. Or worst case scenario, a precancerous lesion is left behind to grow undetected.

[00:12:00] So, as uncomfortable as prep night is, remember, you do the sweeping tonight so your doctor can do the saving tomorrow. Now, there are some medication rules and some prep night survival tips that I want to leave you with because before you even start your clear liquid prep, there are some critical clinical steps you have to take days in advance regarding medications.

[00:12:21] So, if you're taking any daily prescription drugs, especially blood thinners or blood pressure medications, diabetes or weight loss drugs like GLP-1 antagonists, you'll need explicit instructions from your provider well before prep day. For instance, GLP-1 medications like Ozempic, Wagovi or Monjaro slow down gastric emptying. And because of that, anesthesia guidelines often require holding them for up to one full week prior to your procedure to ensure your stomach is completely empty under sedation.

[00:12:52] The same goes for blood thinners and aspirin regimens, which may need to be on hold a few days prior to prevent bleeding if a polyp is removed. But never guess or stop these on your own. Always confirm the exact medication timeline with your GI clinic a week or two out. Now, here are my survival tips. Once you reach that prep night and you're in the trenches sipping that solution, like I am right now, here's some pro tips for getting you through it. Tip number one, chill and chug it.

[00:13:20] Keep the liquid prep cold in the refrigerator. Drinking it through a straw placed at the back of your throat can also help bypass a lot of those taste buds, so it's a little easier to drink. Tip number two, protect your skin. Honey, frequent wiping with toilet paper will irritate sensitive skin fast. So switch to soft, flushable wipes or use a barrier cream like Vaseline or A&D ointment before the prep kicks in. Trust me on this. You'll be glad you did.

[00:13:49] Tip number three, stay hydrated with a variety of fluids. So having a variety of clear liquids like sprouts, apple juice, white grape juice, sports drinks and yellow and green gelatins is an absolute lifesaver. Clear broths and electrolytes can keep your sodium and potassium levels balanced so you don't feel completely drained or weak from flushing out your system.

[00:14:10] And eating green or yellow jello gives you that chewable texture, satisfying the mental sensation of eating solid foods while keeping you strictly on track. Just remember the golden rule, no red, purple or blue dyes because those colors can mimic blood inside the colon. Tip number four, set up camp near the porcelain throne because once you start taking the prep, it starts working. And so don't plan any errands or folding any laundry on any other floor.

[00:14:38] Stay close to the bathroom with a good book, a movie or your favorite podcast like this one. And also another important instruction you'll need to know about is strict NPO status. The morning of your procedure, usually two to four hours prior to your scheduled arrival time, you must go completely NPO, which stands for nil peros or nothing by mouth. That means no water, no clear liquids, no gum and no mints. And yes, I said no gum.

[00:15:06] People ask me all the time, like, I'm not swallowing anything, so why can I have gum? Well, the answer is because the act of chewing stimulates salivary glands and your stomach, causing your acid to produce digestive acids and juices. And that extra gastric fluid in the emptying stomach increases your risk of aspiration under anesthesia. So no gum, no mints, no exceptions.

[00:15:29] And if your provider instructed you to take your essential morning medications like your blood pressure meds, take them with just a tiny microscopic sip of water. Other than that, nothing enters your mouth. This is strictly for your safety under anesthesia to prevent pulmonary aspiration, where fluid from the stomach enters your lungs while you're asleep. When your clinic gives you that final cutoff time, stop completely.

[00:15:52] Now, at the end of the day, a temporary night of discomfort on the toilet is a small price to pay for a life-saving procedure that can stop cancer before it starts. So if you're 45 or older or if you have a family history or symptoms, please do not delay. Call your health care provider today, get that referral and schedule your screening. If today's conversation gave you that extra push or helped you clear up some of those commonly asked questions, share this episode with a friend or your gastroenterologist so they can share with their patients and subscribe.

[00:16:23] Leave us a five-star review on Apple Podcasts or Spotify. And if you got a health question you want me to break down next, visit AskNurseAlice.com and send it in. Your question might be featured in our very next conversation. So this is Nurse Alice, guys. I'm signing off because I got to finish this prep and I'm going to be on the toilet for a while. So until next time, make good choices, be kind to one another and live well, my friends. We'll talk soon.