Look, I know testing your blood sugar at home 47 times in a week sounds excessive. And honestly, it probably is.
But I had a theory I wanted to test, and the only way to know if I was right was to actually test it.
The Question That Started This
I was at Joe’s mom’s house for Sunday dinner. She made her usual: roast chicken, mashed potatoes, green beans, and bread.
I tested before eating: 98. Pretty good.
Two hours after eating, I tested again: 167.
Not terrible, but higher than I wanted. So I started wondering: Which food caused the blood sugar spike?
Was it the mashed potatoes? The bread? Both? Something else?
The only way to know was to eat each food separately and test.
So that’s what I did.
The Experiment: One Week, One Food at a Time
- Monday: Just Chicken – Pre-meal: 95 | 2 hours post-meal: 103 | Spike: 8 points
Chicken barely moved my blood sugar at home. Good to know. - Tuesday: Just Mashed Potatoes – Pre-meal: 101 | 2 hours post-meal: 178 | Spike: 77 points
There’s the culprit. Potatoes destroy my blood sugar level. - Wednesday: Just Green Beans – Pre-meal: 97 | 2 hours post-meal: 106 | Spike: 9 points
Green beans are fine. Expected. - Thursday: Just Bread (2 slices) – Pre-meal: 99 | 2 hours post-meal: 189 | Spike: 90 points
Bread is even worse than potatoes for me. Noted. - Friday: Chicken + Green Beans – Pre-meal: 96 | 2 hours post-meal: 108 | Spike: 12 points
Skipping the carbs keeps blood sugar spikes minimal. - Saturday: Chicken + Green Beans + Small Sweet Potato – Pre-meal: 98 | 2 hours post-meal: 124 | Spike: 26 points
Interesting. Sweet potatoes spiked me less than white potatoes. - Sunday: Full Dinner with Everything – Pre-meal: 97 | 2 hours post-meal: 171 | Spike: 74 points
Confirmed. The mashed potatoes and bread are the problem.
What I Learned: Food Affects Us Differently
My body handles sweet potatoes way better than white potatoes. According to the glycemic index, they’re similar. According to diabetes advice websites, I should avoid both.
But my actual blood sugar testing at home shows sweet potatoes are fine for me.
This is why testing matters more than just Googling.
The Second Experiment: Timing of Exercise
Once I figured out which foods spike me, I wondered: Does exercise affect blood sugar after eating?
I tested this with a “bad” meal (for me): pasta.
- Test 1: Pasta, No Exercise – Pre-meal: 94 | 2 hours post-meal: 201 | Spike: 107 points
Ouch. Pasta wrecks me. - Test 2: Pasta, 15-Minute Walk Immediately After Eating – Pre-meal: 96 | 2 hours post-meal: 147 | Spike: 51 points
A 15-minute walk cut the blood sugar spike in half. - Test 3: Pasta, 15-Minute Walk 1 Hour After Eating – Pre-meal: 95 | 1 hour: 183 | 2 hours: 134 | Spike: 88 at 1 hour, 39 by 2 hours
Walking still helped, but walking immediately after eating worked best.
What I Learned: Movement Timing Matters
Walking right after eating helps more than waiting. My theory: muscles use glucose when you move them, so walking while glucose is entering your bloodstream helps your body process it better.
The Third Experiment: Morning vs. Evening Carbs
Does it matter when I eat carbs? I tested eating the same meal (chicken + rice) at different times:
- Breakfast (8 AM) – Spike: 85 points
- Lunch (1 PM) – Spike: 74 points
- Dinner (6 PM) – Spike: 62 points
Surprisingly, my body handles carbs better at night. Your results may vary, but testing is the key.
The Fourth Experiment: Coffee
I drink coffee every morning, black, no sugar. I noticed my fasting blood sugar was higher on days I had coffee before testing:
- No coffee: 94
- Coffee, 30 min before testing: 107
Apparently, caffeine triggers cortisol, which releases glucose, raising blood sugar levels even without food. Now I test before coffee, problem solved.
The Big Lessons from 47 Tests
- Test the same thing multiple times – One reading isn’t enough. Testing pasta in different scenarios showed what really mattered.
- Your body is unique – Sweet potatoes are fine for me; white potatoes aren’t. Coffee affects me. Your results may differ.
- Context matters – Food combinations affect blood sugar spikes.
- Timing matters – Exercise affects blood sugar more immediately after eating. Carbs at night spike me less.
- Data beats advice – Don’t blindly follow articles. Trust your testing.
What I’m Testing Next
I’ve got new questions:
- Does strength training affect blood sugar differently than cardio? Planning to test: 15 minutes of weights vs. 15 minutes of walking after the same meal.
- Do certain supplements actually work? Testing berberine, cinnamon, and apple cider vinegar one at a time with controlled meals.
- Does sleep quality affect next-day blood sugar? Tracking sleep hours and quality against fasting blood sugar readings.
- Does my mom’s clove tea thing actually work? She swears it dropped her blood sugar 112 points in 3 weeks. I’m skeptical but willing to test it.
Your Turn: Start Experimenting
You don’t need to test 47 times in a week (though you can if you want).
But here’s what I recommend:
- Week 1: Test the same breakfast 7 days. Eat the exact same breakfast. Test before and 2 hours after. See if you get consistent numbers.
- Week 2: Test individual foods. Pick a food you’re not sure about. Eat just that food. Test before and after. Learn how your body responds.
- Week 3: Test exercise timing. Eat the same meal two days. Walk after eating one day, skip the walk the other day. Compare results.
- Week 4: Test meal combinations. Eat carbs alone one day, carbs with protein another day. See which spikes you less.
The Point of All This
I know testing 47 times seems obsessive. Maybe it is.
But here’s what all that testing gave me: confidence.
I know what foods work for my body. I know when to exercise. I know which variables matter and which don’t.
And that knowledge? That came from testing, tracking, and learning from my own data.
Your data will teach you more than any article ever could.
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