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Hi SELF Family,
Thirty minutes of walking lowers your blood sugar more when you split it into ten 3-minute walks than when you do it all at once. Researchers tested this in the same people, with the same meals, at the same walking pace. One 30-minute walk lowered the rise in blood sugar over the day by about 10 percent. Ten 3-minute walks lowered it by about 22 percent, more than twice as much.
Your A1C is your three-month average blood sugar, and an A1C under 5.7 percent is normal. A fasting sugar that looks fine can sit next to an A1C that keeps creeping up, because much of the extra sugar arrives in the hours after meals. In a study of 290 people with type 2 diabetes, those whose A1C was under 7.3 percent got about 70 percent of their extra sugar from the hours after eating.
One 30-minute walk lowered the blood sugar rise 10 percent. Ten 3-minute walks lowered it 22 percent.
The study came out of Zhejiang University in China. It followed 18 young men, average age 21, who carried extra weight and did not have diabetes. Each man spent four separate 8.5-hour days sitting in the lab, with the same breakfast and the same lunch each time, while a glucose sensor on his arm tracked his sugar all day. On one day he never got up. On another he walked 30 minutes on a treadmill at about 2.5 miles per hour, starting an hour after breakfast. On the last two days he spread those same 30 minutes across the day as ten 3-minute breaks, one every 45 minutes. One day the breaks were easy walking at the same pace. The other day they were slow squats down to a chair.
Every active day beat sitting. The single walk lowered the blood sugar rise by about 10 percent. The walking breaks lowered it by about 22 percent, and the squat breaks lowered it by the same 22 percent. The squats and the walking breaks tied. Splitting the movement up is what won.
The timing explains a lot of it. The long walk was over an hour and a half into the day. Lunch came two hours later, and lunch was the big meal, with about 188 grams of carbohydrate compared with about 58 grams at breakfast. The breaks kept coming every 45 minutes through lunch and the afternoon, so they caught the sugar from both meals while it was still in the blood.
The men also wore shorts with muscle sensors built in. The harder their thigh and glute muscles worked over the day, the lower their blood sugar went. A working muscle pulls sugar out of your blood without waiting for insulin. Ten breaks meant ten trips up out of the chair, and the researchers think those extra trips are part of why the breaks worked the thighs and glutes harder than one long walk did.
These were 21-year-olds, and the same pattern held up in older adults who already have type 2 diabetes. Researchers in Australia had 24 adults with type 2 diabetes, average age 62, sit for 8 hours on three separate days with the same meals. On two of those days they got up every 30 minutes for 3 minutes, either to walk slowly at about 2 miles per hour or to do simple moves like half squats and calf raises. Both kinds of breaks cut the blood sugar rise by about 39 percent compared with sitting all day, and cut insulin by more than a third.
If you love your after-dinner walk, keep it. The Zhejiang study never tested one long walk after the biggest meal of the day. It tested one walk after a small breakfast against breaks that covered every meal, and the breaks won. Your job this week is to add the breaks.
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Your break plan
The timer: Set a timer for every 30 to 45 minutes you sit, from breakfast through the afternoon.
The walk: Walk for 3 minutes at an easy pace of about 2 to 2.5 miles per hour, a pace where you can talk the whole time. A hallway or a lap around the house counts.
The squat: Or do 3 minutes of slow squats to your chair. Lower yourself until your seat touches the chair, stand back up, and do one squat every 5 seconds. That is about 36 squats.
Your knees: If your knees hurt, keep the squats shallow and hold the edge of the desk, or walk instead. The walking breaks worked just as well.
The check: If you wear a glucose monitor, compare a day with breaks to a day without them, and look at how high and how long your sugar climbs after each meal.
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Start tomorrow with the longest stretch you sit after a meal, whether that is at your desk after lunch or on the couch after dinner.
The breaks are one of four moves in the new video. The video shows how one minute on the stairs after a sugar drink lowered the blood sugar peak. It covers the 3-minute circuit that also cut blood fats by about 40 percent in adults with type 2 diabetes. It also shows the seated heel raise that cut the sugar rise roughly in half, and the one detail most people who share that study leave out. Watch This Lowers Blood Sugar Twice as Much as Walking After Meals
With gratitude,
Dr. Sean
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