Blood Sugar 143 mg/dl — Too High? Fasting & After Eating

What was on the plate before a two-hour 143?

A reading of 143 two hours after eating is three points into the impaired glucose tolerance band of 140 to 199. On a home meter that is within the error margin of the line, so the first useful question is not about your pancreas but about the meal. The same person can see 110 after one dinner and 160 after another. Before deciding what a 143 means, look at what produced it.

Timing and setting play a part too. A meal eaten fast, late in the evening or after a long stretch without food often gives a higher two-hour value than the same food eaten slowly at midday. Sitting on the couch afterwards rather than moving around the house also leaves more glucose in the blood at the two-hour check.

Meal features that tend to land readings in the low 140s

• Starch that digests fast. White bread, bagels, white rice, potatoes, crackers and most breakfast cereals turn into glucose quickly. A large serving can keep the curve high at the two-hour mark.
• Sugar in liquid form. Juice, soda, sweet tea, smoothies and sweetened coffee drinks need no chewing or digestion, so their sugar arrives almost at once.
• Little fiber or protein. A bowl of pasta with a thin tomato sauce raises glucose faster than the same pasta with vegetables, beans or chicken.
• A large total amount. Portion size matters as much as food choice. Two servings of brown rice can push a curve higher than one serving of white rice.
• Hidden carbohydrate. Sweet sauces, glazes, breading and dressings add sugar and starch that are easy to overlook.

Fat and the late peak

Rich meals behave differently. Fat slows the emptying of the stomach, so after pizza, fries or a creamy pasta dish, the glucose peak can come later and last longer. Sometimes the two-hour value ends up higher than the one-hour value, the reverse of the usual pattern. A 143 at two hours after a pizza night may simply be the peak arriving late rather than a sign of slow clearance.

Fat on its own does not raise glucose, and a moderate amount with a meal tends to make the rise gentler. It is the combination of plenty of fast starch with plenty of fat that stretches the curve.

Turning one 143 into a useful experiment

A single reading tells you about one meal on one day. To learn something about yourself, test the same, ordinary meal two or three times, two hours from the first bite. Then change one thing and test again: half the rice and twice the vegetables, water instead of juice, the sandwich on whole-grain bread instead of white. If the change brings readings under 140, you have found a lever that works for you.

If readings stay at 140 or above even after modest, balanced meals, that pattern is worth showing to your doctor, who may suggest an A1C or a glucose tolerance test. The what affects blood sugar page covers other influences such as stress, sleep and illness, and blood sugar diet foods lists swaps.