Before You Blame the Food, Keep a Two-Week Log

Quick answer: Write down what you eat, when your gut acts up, how stressed you were and how you slept, for fourteen days. The pattern usually points at food, stress or something else. If you have blood, black stools, weight loss you can't explain, trouble swallowing or pain that wakes you at night, skip the log and call a doctor this week.

A man cuts dairy in January. In February he drops bread. By March he's eating grilled chicken and white rice like a bodybuilder on a budget, and his stomach still hurts on Tuesdays. He's down three foods and no closer to an answer.

That's the usual way people handle this. Guess, eliminate, guess again. It feels like action. It mostly produces a shorter menu and the same stomachache.

A log is slower for about two weeks and faster after that.

What goes on the card

Keep it to one side of an index card per day. You'll actually do it.

• Meals and drinks, with times. Include coffee, alcohol and that handful of gas station peanuts.
• Symptoms, with times. Bloating, cramping, heartburn, loose or hard stools, nausea. Plain words are fine.
• Stress, 1 to 10. A rough number at lunch and one at bedtime.
• Sleep, in hours.
• Anything you swallowed that isn't food. Ibuprofen, a supplement, an antibiotic, a new prescription.

Don't change how you eat during these two weeks. The point is to catch what's already happening. If you clean up your diet for the experiment, you'll have recorded a fiction.

Read the timing

Lay the cards side by side and look at when things go wrong, not just what you ate.

If symptoms follow a specific food within a few hours, over and over, suspect the food. Milk and ice cream are the classic case, because many adults lose some of the enzyme that digests lactose as they age. A huge, greasy meal can do it to anybody. So can a sudden jump in fiber, which is why the guy who starts a bran-and-beans diet on a Monday regrets it by Wednesday. If you're raising fiber, do it over a few weeks and drink water with it.

If the bad days line up with your calendar instead of your plate, suspect stress. Mondays. The day of the quarterly review. The week the in-laws visit. Better on vacation, worse on deadline. The gut and the brain are wired together, and a nervous system running hot changes how your digestive tract moves. It's not imaginary and it's not weakness. It's plumbing connected to wiring. If that's your pattern, Stress Doesn't Stay in Your Head is worth reading next.

If it happens no matter what you ate or how your week went, it's something else. That's the category people skip, and it's where the log earns its keep.

The "something else" list

Check the card for these before you blame a food.

• Medications. Ibuprofen and similar pain relievers can irritate the stomach lining. Some antibiotics wreck your gut for a while. Metformin is known for stomach side effects early on. Iron pills can bind you up. Ask your pharmacist about anything you started within a month of the trouble.
• Magnesium supplements. A common cause of loose stools. People take them for sleep and never connect the two.
• Sugar-free products. Gum, candy and "keto" bars often use sugar alcohols like sorbitol, which many people can't tolerate in quantity.
• Coffee and alcohol. Three cups before noon on an empty stomach is a decision, and your gut notices it.
• Speed. Eating a lunch in six minutes at your desk means swallowing air and under-chewed food. Boring fix, real effect.
• Sleep. If your worst days follow your shortest nights, put that on the card in ink.

Past that, you're in doctor territory. Reflux disease, ulcers, gallbladder trouble, celiac disease, irritable bowel syndrome and thyroid problems can all look like "something I ate." Sorting them out takes an exam, sometimes blood work, sometimes a scope. That's not a project for your kitchen.

One warning on that. If celiac disease is a possibility, don't stop eating gluten before you've talked to your doctor. The standard tests work best while you're still eating it, and going bread-free first can hide the answer.

When you skip the log

The card is for annoying, on-and-off trouble. Some symptoms mean you pick up the phone instead.

• Blood in your stool, or stools that are black and tarry
• Weight loss you didn't plan
• Trouble swallowing, or food that feels stuck
• Vomiting that won't quit
• Pain that's severe, or that wakes you from sleep
• A lasting change in your bowel habits, especially past age 45
• A close relative who had colon cancer or celiac disease

Any one of those gets a call. Don't wait out two weeks of logging first. Colon cancer screening in the U.S. is generally recommended to start at 45 for people at average risk, earlier if it runs in your family. If you're past that age and haven't had the conversation, this is your nudge.

Heartburn that isn't

Most chest burning after a heavy meal is reflux. But pressure, tightness or pain in the chest, especially with sweating, shortness of breath, nausea or pain moving into the jaw or arm, isn't something to settle by taking an antacid and waiting. Read What a Heart Attack Actually Feels Like now, while you're calm, and not at 2 a.m. when you're guessing. If you're unsure, call 911. Nobody ever got a lecture for being wrong in that direction.

Taking the card to the appointment

Doctors hear "my stomach's been off" about forty times a week. A two-week card turns that into data. It shows when it hurts, what you were taking, how you were sleeping, and what you already ruled out. You'll get a better visit in less time.

If cost is what's holding you back, The Four Numbers That Decide What Your Health Plan Costs will help you figure out what an appointment actually runs you.

And be patient with the process. If your culprit is food, you may need a second round of logging after one change. If it's stress, you may need to fix the thing causing it, which is harder than skipping the lasagna. If it's something else, you want to know that soon.

Fourteen days, one pen, one card. It's the cheapest diagnostic tool in the house, and it beats another month of chicken and rice.