Write down how things are before you start, change one thing, check in on the same question every day, and look back on the date you picked. This sheet holds all four steps on one page, and the journal page behind it holds the days.
We call it a two-week try because two weeks is a reasonable starting point for many everyday changes. That's our default. No guideline sets the number, some changes need longer, and some should never be made on your own. Print the pages, or save them as a PDF.
One change at a time. Never stop or change a prescribed medicine to test it. If a warning sign shows up during the try, stop and see a doctor.
A good fortnight is a strong clue. Repeating it is stronger.kasanelife.com/printables/two-week-try
One line per entry: the time, the kind, and what happened in your words. Kinds: meal · drink · symptom (0–3) · sleep · energy (0–3) · exercise · stress · medicine · note. For example: 3:15 pm · energy · 1, could have napped at my desk.
Same question, same three answers, about the same time each day.kasanelife.com/printables/two-week-try
How to use it
- Start with a baseline. Spend a week or two noting the symptom you care about before you change anything, and fill in the "Before" row. Sleep specialists ask for exactly this: the American Academy of Sleep Medicine uses a baseline sleep log of one to two weeks (AASM).
- Change one thing. The British Dietetic Association puts it plainly: "Make one change at a time so that you can see what has helped" (BDA).
- Check in the same way every day. Same question, same three answers, around the same time. "Bloated after lunch: none, a little, a lot" is enough.
- Look back on the date you picked. Count the days with the symptom in each row, compare the two stretches as a whole, and make a call: helped, no clear effect, made it worse, or needs another round.
Symptoms move around on their own, and expectation plays a part: across 73 IBS drug trials, 37.5% of people taking a placebo improved (Ford & Moayyedi). So treat one good fortnight as a strong clue. If it matters, stop and restart the change and see whether the pattern comes back. The full method is in how to tell if a change is working.
The sheet follows the same steps as an experiment in Kasane: a question in your words, one change, a daily check-in, and a look-back.
What not to change on your own
- Prescribed medicines. Never stop or change a prescription to test it. Talk to the doctor who prescribed it first.
- Gluten, if celiac disease is possible. The blood test needs you to keep eating gluten, in more than one meal a day for at least 6 weeks beforehand (NICE NG20). Get tested first.
- Anything that makes you cut many foods at once. If you find yourself avoiding more and more foods to feel okay, that's a reason to see a doctor or dietitian.
Stop the try and see a doctor if new warning signs appear, such as blood in your stool, weight loss you can't explain, or diarrhea that wakes you at night. NICE says warning signs that appear during management and follow-up "should prompt further investigation" (NICE).