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1. Ulcerative colitis
(UC) is a chronic inflammatory disease of the large intestine. It belongs to a group of conditions called inflammatory bowel diseases, or IBD. The central idea is that the immune system becomes involved in an ongoing inflammatory response in the lining of the colon and rectum. This causes irritation, small ulcers, and sometimes bleeding.
1. What happens inside the body?Your large intestine, or colon, absorbs water and helps form stool. Its innermost lining is called the mucosa. In ulcerative colitis, inflammation affects the mucosa and usually begins in the rectum, extending upward into the colon to varying distances.
What the inflammation does
When the lining becomes inflamed:
The colon becomes irritated and may develop ulcers.
It has difficulty absorbing water and handling stool normally.
The inflamed lining may bleed or produce mucus.
The body can develop urgency, frequent bowel movements, abdominal discomfort, and diarrhea.
The inflammation can be mild or severe. It can also involve a short section of the colon or much of the large intestine.
2.
How ulcerative colitis works—and how Remicade works
The most useful way to understand ulcerative colitis is to think of it as a problem involving the immune system, the intestinal lining, and the signals that regulate inflammation.
Remicade is interesting because it doesn't suppress every part of the immune system equally. It targets one particularly important inflammatory signal: TNF-alpha.
I'll start with what we understand about the disease itself, then connect that to what biologics do.
1. What we know about the underlying disease
The intestinal lining is an active immune environment
The colon isn't just a passive tube. Its lining is constantly interacting with:Food particles and digestive contents. Billions of microbes. The body's own epithelial cells Immune cells that monitor for threats.
Normally, the immune system maintains a balance: it can respond to genuine danger without launching unnecessary attacks against the intestinal environment.
In UC, that balance becomes disrupted. The result is an inflammatory response that can persist even when there is no ordinary infection to eliminate.
A useful scientific distinction: we understand many of the mechanisms involved, but we do not yet know the single initiating cause of UC.
The intestinal barrier
The colon's epithelial lining acts as a barrier between the contents of the bowel and the tissues underneath.
When the barrier is damaged or its regulation is impaired, immune cells can encounter substances from the gut environment more readily. Inflammation can then damage the lining further.
The key inflammatory signal: TNF-alpha
This is where Remicade becomes especially interesting.
TNF-alpha stands for tumor necrosis factor alpha. It is a cytokine—a chemical messenger used by immune cells to communicate.
Cytokines are not inherently bad. They are essential for fighting infections, coordinating inflammation, and repairing tissue. The problem is that an inflammatory signal can become harmful when it is produced in the wrong context, in the wrong amount, or for too long.
What does TNF-alpha do?
Think of TNF as one of the alarm signals in the immune system.
How Remicade works
is the brand name for infliximab.
It is a biologic medicine, meaning it is a complex biological molecule rather than a conventional small-molecule pill.
More specifically, infliximab is a monoclonal antibody that targets TNF-alpha.
The lock-and-key idea
Imagine TNF-alpha as a message that needs to reach a receptor on a cell.
Remicade binds to TNF-alpha and prevents it from carrying out its normal inflammatory signaling.
On Diet:
Oatmeal
Start with:
½ cup dry oats, cooked thoroughly — roughly 1–1½ cups cooked depending on preparation.
If that feels like too much, use ¼ cup dry at first.
Choose plain oats rather than heavily sweetened instant packets.
Add tolerated foods such as banana, blueberries, peanut butter, ground flax, or a little maple syrup.
For someone with active diarrhea, begin smaller—perhaps ¼ cup dry oats—and see how the gut responds. Oatmeal is often easier to tolerate than bran cereal because it contains more soluble fiber and is soft when cooked.
Bread
Start with one slice daily, then move to two if comfortable.
In remission: try a bread with whole grains or oats.
During a flare: sourdough, white, potato, or other lower-fiber bread may be easier than dense bran bread.
Avoid assuming that “more whole grain is always better.” The bran can worsen symptoms for some people during active inflammation.
Also, bread is not itself a major source of butyrate unless it contains enough fermentable fiber that reaches the colon. Think of it mainly as a tolerable carbohydrate and, when whole-grain, an additional fiber source.
Yogurt
A good target is:
¾–1 cup plain yogurt daily
Prefer unsweetened Greek yogurt if you want more protein.
Choose a yogurt with live and active cultures.
If lactose bothers you, use lactose-free yogurt or kefir.
Yogurt may provide useful bacteria, protein, calcium, and sometimes vitamin D, but fermented foods have not been proven to reliably induce UC remission. The evidence for probiotics in UC is mixed and product-specific.
Avoid turning yogurt into a dessert with lots of added sugar. Add fruit yourself if tolerated.
Sauerkraut
Start much more modestly:
1 tablespoon daily with a meal
If comfortable for a week, try 2 tablespoons
There is no need to force your way to a large serving.
Choose refrigerated, unpasteurized sauerkraut with live cultures if your clinician says fermented foods are appropriate for you. Shelf-stable or pasteurized sauerkraut may still provide vegetables and acidity but generally will not provide the same live-microbe exposure.
Sauerkraut can be problematic because it is:
High in salt
Gas-producing for some people
Sometimes spicy or heavily seasoned
A source of histamine and other fermentation products that some people tolerate poorly
If it increases urgency, cramping, bloating, or diarrhea, stop it. Sauerkraut is optional; it is not essential.
What else should be included?
The most useful overall pattern is closer to a flexible Mediterranean-style diet, adapted to your tolerance: varied plants, olive oil, fish or other protein, complex carbohydrates, and fewer ultra-processed foods. Gastroenterology guidance supports this pattern for general health, but no diet consistently prevents IBD flares in adults.
1. Protein at every meal
This is especially important during active disease because nutritional needs can rise.
Good options include:
Eggs
Fish, especially salmon or sardines
Chicken or turkey
Tofu or tempeh
Greek yogurt
Smooth nut butter
Beans or lentils if tolerated
Cottage cheese or other dairy, if tolerated
A simple rule: include one palm-sized protein serving at lunch and dinner, plus yogurt, eggs, or another protein at breakfast.
During a flare, beans, lentils, nuts, seeds, and large portions of meat may be difficult for some people. Use softer forms—smooth nut butter, tofu, eggs, fish, or well-cooked legumes.
2. Fruit—usually start with softer forms
Aim eventually for 2 servings daily, but build gradually.
Often-tolerated choices include:
Banana
Applesauce
Cantaloupe or honeydew
Blueberries
Cooked or peeled apples
Smoothies, if they do not worsen symptoms
During a flare, remove skins and seeds, cook fruit, or blend it. Whole fruit is preferable when tolerated, but a banana or applesauce is better than avoiding fruit altogether.
3. Vegetables—cooked first if necessary
Work toward 2–3 servings daily, increasing variety slowly.
Start with:
Cooked carrots
Squash
Sweet potato without skin
Green beans
Zucchini
Well-cooked spinach
Peeled potatoes
Pureed vegetable soups
In remission, gradually experiment with salads, raw vegetables, cruciferous vegetables, and more varied textures. During a flare, cooked, peeled, chopped, or blended vegetables are often easier than raw vegetables and tough skins.
4. Healthy fats
Include modest amounts of:
Extra-virgin olive oil
Avocado
Walnut butter
Ground flax or chia, if tolerated
Salmon, sardines, or trout
A practical amount is 1–2 tablespoons of olive oil across a meal or day, adjusted for calories and tolerance. Avoid relying heavily on butter, fried food, or very fatty meals, which commonly worsen symptoms even if they do not necessarily cause inflammation.
5. Other sources of fermentable fiber
Oatmeal is only one source. When tolerated, rotate among:
Barley
Brown rice or wild rice
Potatoes that are cooked and cooled, then reheated
Sweet potatoes
Bananas
Berries
Lentils and beans
Chickpeas
Cooked onions or leeks, if tolerated
Ground flax
Chia
Nuts or nut butter
Do not add all of these at once. A sensible approach is:
Add one new fiber-rich food every 3–4 days, in a small portion.
This makes it easier to tell what your gut accepts. The Crohn’s & Colitis Foundation specifically recommends gradually increasing fiber after a flare rather than making a sudden large increase.
A simple example day
Breakfast
½ cup dry oatmeal, cooked
Banana or blueberries
¾ cup plain Greek yogurt
Optional: 1 teaspoon ground flax, if tolerated
Lunch
One or two slices of bread
Turkey, tuna, egg salad, tofu, or hummus
Cooked carrots or soup
Fruit or applesauce
Snack
Yogurt, kefir, banana, or smooth peanut butter on toast
Dinner
Salmon, chicken, tofu, eggs, or beans
Rice, potato, or another starch
Cooked vegetable
Olive oil or avocado
Optional: 1–2 tablespoons sauerkraut on the side
Fluids
Drink regularly, especially with diarrhea. A useful practical target is urine that is pale yellow, but people with frequent loose stools may need additional electrolytes or an oral rehydration drink.
Remission versus flare
If you are in remission
Try to build toward:
Oatmeal most days
1–2 slices of whole-grain bread if tolerated
Yogurt daily
Small sauerkraut serving if tolerated
Several different fruits and vegetables
Protein at each meal
Olive oil, fish, nuts, or seeds
A broad variety of plant foods
The long-term goal is variety, not a narrow list of “safe” foods.
If you are flaring
Temporarily prioritize:
Smaller, more frequent meals
Soft, cooked foods
Oatmeal in a smaller portion
White or sourdough bread if whole grain worsens symptoms
Yogurt if tolerated
Less or no sauerkraut
Peeled/cooked fruit and vegetables
Extra protein and fluids
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