Consider the total composition of your plate. While carbohydrate counting is the standard, many find that accounting for fat and protein is equally important. High fat and protein content can often delay the digestion of carbohydrates, which may impact when insulin is needed.
Before deciding on a dose, evaluate your current "starting line." This includes checking your current blood glucose, noting any Insulin on Board (IOB) from previous doses, and considering recent or upcoming physical activity, which can significantly alter insulin sensitivity.
Start with the base dose required for the carbohydrates you are about to consume. This is typically determined by your insulin-to-carb ratio (ICR) as prescribed by your doctor.
If your blood glucose is above your target range, you might consider layering a correction dose. A common formula: (Current BG − Target BG) ÷ Correction Factor = Units to Add. From this total, many people subtract their remaining IOB to avoid "stacking" insulin and causing a low later.
Not all meals require all the insulin at once. "Building the shape" refers to how the dose is delivered. Those using a pump might consider an extended or dual-wave bolus for high-fat meals. Those on MDI (injections) might discuss with their doctor whether splitting a dose into two separate injections is appropriate for certain food types.
Timing is often as important as the dose itself. "Offsetting" is the practice of matching the insulin's peak action with the meal's glucose peak — commonly known as a pre-bolus. Factors like the type of food and your current blood glucose level typically dictate how many minutes the insulin is given before the first bite.
The process doesn't end when the meal is over. By observing the post-meal trend on a CGM or via finger sticks, you can see how well the dose and timing matched the meal. This data is the key to mastering future management.
Diabetes is a game of patterns. If the Look phase showed a spike or a drop, use that information to tweak the variables for the next time you eat a similar meal. Small, incremental adjustments are often the safest way to find what works for your unique needs.
Because insulin is a powerful medication, review these points carefully before applying this framework.