Don’t Let Trendy Diets Empty Your Gut! A Gastroenterologist Explains the Health Traps of Olive Oil, 168, and the Ketogenic Diet
林峰年醫師（健康診所消化內科）內醫字號010771號0771號
2026-04-20
目錄
“Dr. Lin, I heard that drinking olive oil with lemon juice can detoxify and help you lose weight?”
“Dr. Lin, I’ve recently started a ketogenic diet, but my stomach often feels dull and painful…”
“Doctor, I’ve been fasting on 168 for three months, why is my acid reflux getting worse?”
In my clinic, I often encounter patients with boundless enthusiasm (and those following celebrity diets circulating online) asking me these questions. Modern people have an almost religious fervor for “rapid weight loss” and “extreme skincare,” but as a gastroenterologist, I must pour some cold water on this: many trendy diets are actually silently “bullying” your digestive system.
Myth 1: Drinking "olive oil + lemon juice" can help you maintain your health? Beware of damaging your stomach instead of detoxing.
The “extra virgin olive oil with lemon juice” skincare method recently popular among Korean celebrities claims to cleanse the intestines and beautify the skin. It sounds natural, but it could be a disaster for your stomach and gallbladder.
1. A Breeding Ground for Acid Reflux
Consuming too much oil significantly slows down gastric emptying. The longer oil stays in the stomach, the more stomach acid is secreted. Combined with the fact that oil relaxes the lower esophageal sphincter, this is why many people experience heartburn and a sore throat after drinking oily beverages.
2. A Catalyst for Gallstones
To emulsify the large amount of fat entering the stomach, the gallbladder must contract strongly and secrete large amounts of bile. Frequently adopting this extreme oil-drinking method can lead to fat accumulation, increasing the risk of gallstones.
3. The Acidic Irritation of Lemon Juice
Although lemon juice becomes alkaline after metabolism, it remains highly acidic when it enters the stomach. Concentrated lemon juice directly irritates the stomach lining, causing stomach acid secretion to become even more uncontrolled. For people with thin stomach walls or a history of ulcers, this is like adding insult to injury.
Myth 2: Why Do 168-Hour Fasting and the Ketogenic Diet Lead to Gallstones?
Many people believe that 168-hour fasting (fasting for 16 hours daily) or the ketogenic diet (extremely high fat, extremely low carbohydrates) are effective weight loss methods, but they overlook the impact on their gallbladder.
● Prolonged Fasting: The Hidden Danger of Bile Accumulation
The gallbladder’s function is to store bile and release it to aid digestion when we eat. When performing 168-hour fasting or more aggressive fasting methods, the gallbladder lacks the signal to contract due to the excessively long fasting period, causing bile to “stagnate” within the gallbladder for extended periods. This stagnant bile becomes increasingly thick, eventually crystallizing into bile sand and even developing into gallstones.
● Ketogenic Diet: High-Pressure Labor for the Gallbladder
The ketogenic diet requires a very high proportion of fat intake. This forces the gallbladder to be in a state of “high-pressure emptying” for extended periods to cope with the digestion of large amounts of fat. This extreme fluctuation (prolonged inactivity vs. short-term violent contractions) places a significant burden on the biliary system.
Dr. Lin's Weight Loss Truth: Returning to "Whole Foods" and "Negative Calories"
Whenever patients ask me what to eat to lose weight or how to maintain their digestive health, I always stick to these two core principles:
1. Whole Foods
What are whole foods? They are foods whose original appearance you can see.
Instead of drinking lemon juice: Eat lemon slices directly. This way, you not only get Vitamin C but also complete fiber, which helps with bowel movements.
Instead of drinking oil directly: Add olive oil to salads or other dishes. Ingesting olive oil with meals is the most natural way, without putting extra strain on the body, and it also helps with the absorption of fat-soluble vitamins.
2. The Negative Calorie Principle
There are no shortcuts to weight loss; only calorie intake must be lower than calorie expenditure. Instead of pursuing extreme diets, choose foods that are “bulky, low in calories, and high in fiber,” allowing your digestive system to maintain a stable metabolism without starvation.
Conclusion: Reject "Processed Health," Embrace "Real Foods"
Digestive health is actually quite simple; it doesn’t require complicated formulas or expensive oils.
Use lemons in your cooking to add flavor.
Add olive oil to salads and absorb it with your meals.
Eat regularly, avoiding blindly pursuing long periods of fasting; allowing your gut to function properly is the long-term solution.
As a doctor, I understand everyone’s desire to be beautiful and slim. But while pursuing a beautiful appearance, please remember: a healthy soul needs a well-functioning digestive system. Don’t let your stomach become a guinea pig for trendy diets!
Let’s reject “processed health,” embrace “real foods,” and restart your gut’s vitality!
FAQ
Q1: I’ve heard that drinking olive oil and lemon juice daily can cleanse the intestines and detoxify the body. Is it really effective?
A: Doctors advise caution when trying this. Directly consuming too much fat slows down gastric emptying, stimulates more gastric acid secretion, and can easily lead to acid reflux. Furthermore, the strong acid in lemon juice directly irritates the stomach lining; for people with stomach ulcers or thin stomach walls, it can actually worsen the condition instead of detoxifying.
Q2: Why is it easier to develop gallstones after following a 168-hour fast?
A: Because prolonged fasting (more than 16 hours) causes the gallbladder to lack contraction signals, resulting in bile stagnating and becoming thick. This stagnant bile easily crystallizes to form bile sand, eventually developing into gallstones.
Q3: What are the effects of a high-fat diet on the biliary system?
A: A ketogenic diet forces the gallbladder to be in a state of high-pressure emptying for extended periods to digest large amounts of fat. This extreme fluctuation between prolonged periods of inactivity (fasting) and short periods of intense contractions (eating) places a significant burden on the biliary system, increasing the risk of disease.
Q4: What should I do if I experience acid reflux or heartburn while following a weight loss plan?
A: This is usually a warning sign of gastroesophageal reflux disease (GERD). It is recommended to stop extreme oil consumption or excessive fasting and observe whether it is caused by prolonged fasting or excessive intake of irritating foods (such as concentrated lemon juice). Return to a regular diet and consult a professional physician to avoid damaging the stomach lining.
Q5: Which method of intake is recommended by doctors, drinking oil or fruit juice directly?
A: Doctors recommend consuming “whole foods.” Instead of drinking oil, try adding olive oil to salads and eating it with meals; instead of drinking lemon juice, eat lemon slices directly. This not only reduces the burden on the digestive system but also provides complete fiber, aiding in the absorption of fat-soluble vitamins.
Q6: What is the healthiest and most digestive-friendly weight loss principle?
A: There are two core principles:
Prioritize whole foods: Reduce metabolic burden and obtain complete nutrition.
Follow the calorie-deficient principle: Choose foods that are “large in volume, low in calories, and high in fiber” to ensure that calorie intake is lower than expenditure, while maintaining regular gastrointestinal function.
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