How to Keep a Food and Symptom Diary for Gas and Bloating

By KT Apps · Updated October 17, 2026

A note first

This article is general information, not medical advice. A diary can help you and your doctor, but it cannot diagnose anything. See a doctor promptly for severe or persistent abdominal pain, blood in your stool, unexplained weight loss, ongoing diarrhoea or vomiting, difficulty swallowing, a fever, or a lasting change in bowel habits. Before cutting out whole food groups, it is wise to get professional advice.

What to record

A diary is most useful when it covers three things, each with a time:

• Meals and drinks: what you ate and drank, roughly how much, and when. Include snacks, chewing gum, sweeteners and fizzy drinks, which are easy to forget.
• Symptoms: what you felt, such as bloating, rumbling, trapped gas, gas passed or pain, and how strong it was on a simple scale from 1 (mild) to 5 (severe).
• Context: anything else that might matter, such as stress, poor sleep, exercise, a period, a new medicine or eating in a hurry.

Times matter because symptoms often appear hours after a meal, not straight away.

Keeping it going

1. Write things down as they happen, not at the end of the day. Quick entries are better than detailed ones you never make.
2. Use the same 1 to 5 scale every time, so a 3 means the same thing on Monday and on Friday.
3. Record good days too. Knowing what you ate on a day with no symptoms is just as useful.
4. Eat normally while you keep the diary, at least at first. Changing your diet at the same time makes the pattern harder to read.
5. Keep going for at least two weeks, and ideally three or four. One bad evening tells you very little; a repeated pattern tells you much more.

Looking for patterns, carefully

After a few weeks, look for foods that keep appearing before symptoms, and foods that never seem to cause trouble. Some cautions help you avoid false conclusions:

• Meals overlap. If you ate onions and bread together, the diary cannot tell which one was responsible.
• Amount matters. A small portion of a food may be fine while a large one is not.
• Some foods are eaten so often that they appear before every symptom simply by chance.
• Stress, sleep and hormones can change how your gut reacts to the same food.

Treat a pattern as an idea to test, ideally with professional guidance, not as proof. For common culprits, see what foods cause gas and bloating.

Sharing the diary with a doctor

If you see a doctor or dietitian about gut symptoms, a few weeks of notes make the appointment far more useful. Bring a summary: how often symptoms happen, how strong they usually are, the foods you suspect, and anything else you noticed, such as symptoms waking you at night or changes in your bowel habits. They may suggest tests or a structured elimination and reintroduction plan, which is more reliable than guessing.

Keeping the diary in GasLog

GasLog has quick buttons for each kind of entry on the Home tab:

1. Tap Meal, choose Breakfast, Lunch, Dinner or Snack, and select foods from categories such as Grains, Vegetables, Beans, Dairy and Drinks. Type a name to add a food that is not listed.
2. Tap Condition, select symptoms such as Bloating, Gas Buildup, Rumbling or Pain, and set the intensity from 1 to 5.
3. Tap Gas to record an episode with a smell level and, optionally, a sound level. Adjust the date and time if you are recording later, and add a memo for context.
4. Use the Calendar tab to review any day and edit or delete entries.
5. Open the Analysis tab to see foods most often followed by discomfort, gentler foods, your most common symptoms and a weekly trend.

The analysis counts gas and symptom entries recorded within 24 hours of each food over the last 30 days. It is a rough summary of your own records and cannot separate overlapping meals. On the web, records stay in this browser; the iPhone and Android apps can send a daily reminder.

Frequently asked questions