1. Carbohydrates
Of all the three sources of energy from food (carbohydrates, protein, and fat), carbohydrates affect my blood glucose the most. Accurately counting carbs is very difficult, and getting the number wrong can dramatically affect blood glucose. The type of carbohydrate also matters – higher glycemic index carbs tend to spike blood glucose more rapidly.
2. Fat
Fatty foods tend to make people with diabetes more insulin resistant, meaning more insulin is often needed to cover the same amount of food relative to a similar meal without the fat. On my pump, I typically use temporary basals or extended boluses (square and dual-wave) to cover high-fat meals. This effect is most notable if you eat a lot of fat at one time – for instance, when snacking on nuts, I’ll observe a steady rise in blood glucose over many hours.
Wolpert et al., Diabetes Care 2013
3. Protein
If you’ve ever eaten a protein-only meal with very few carbs (e.g., salad with chicken), you may have seen a noticeable rise in blood glucose (~20-50 mg/dl). Though protein typically has little effect on blood glucose, in the absence of insulin, it can raise blood glucose. When I’m eating a carb-free, protein-only meal, I still take a bit of insulin to cover it (usually an equivalent of about 10-15 g of carbs)
Franz, Diabetes Educator 1997
Smart et al, Diabetes Care 2013
4. Caffeine
Many studies have suggested that caffeine increases insulin resistance and stimulates the release of adrenaline. Personally, I know that if I have a cup of coffee, I’ll see at least a 20-30 mg/dl rise in blood glucose, particularly in the morning when I’m more insulin resistant.
Lane, Journal of Caffeine Research 2011
5. Alcohol
Normally, the liver releases glucose to maintain blood sugar levels. But when alcohol is consumed, the liver is busy breaking the alcohol down, and it reduces its output of glucose into the bloodstream. This can lead to a drop in blood sugar levels if the alcohol was consumed on an empty stomach. However, alcoholic drinks with carbohydrate-rich mixers (e.g., orange juice) can also raise blood sugar. When drinking alcohol, make sure you test your blood glucose often and that someone responsible nearby knows you have diabetes.
American Diabetes Association
MEDICATION
Factor
Typical Effect on Blood Glucose
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