Food Tracking With Diabetes: Carb Counting Basics and Working With Your Care Team

This guide is general information, not medical advice. If you have diabetes, especially if you use insulin or medicines that can cause low blood sugar, set your targets and make changes with your diabetes care team.

For many people with diabetes, carbohydrate is the part of food that affects blood glucose most directly. That makes a food diary a useful tool: it shows how much carbohydrate you eat, when, and, if you measure your glucose, how your readings sit alongside your meals.

Carb counting in grams

Carbohydrate counting means adding up the grams of carbohydrate in what you eat. Food trackers do the arithmetic once you log the right food and portion.

• On a label, use total carbohydrate per serving, and adjust for the amount you actually eat. Our guide to reading labels shows how.
• Carb choices. Some people count in “choices” of about 15 g of carbohydrate each, roughly a small piece of fruit or a slice of bread. Grams are more precise; choices are quicker.
• Fiber is a carbohydrate the body largely does not digest. Whether to subtract it is a question for your care team, especially if you dose insulin by carbohydrate.

The plate method

If counting every gram feels like too much, the plate method used in diabetes education is a simpler start: fill half the plate with non-starchy vegetables, a quarter with lean protein and a quarter with carbohydrate foods such as whole grains, beans or starchy vegetables, with water or a zero-calorie drink.

What to log

Log	Why
Every meal and snack, with carbohydrate grams	The core of carb counting
The time you eat	Timing matters for glucose and medication
Glucose readings, if you take them	To see readings beside meals over time
Physical activity	Activity can lower glucose
Drinks, including juice and alcohol	Both can affect glucose substantially

Some food trackers can record glucose readings, typed in or synced from your meter or sensor app through Apple Health or Health Connect, and show them on the same timeline as your meals. That makes patterns easier to discuss at appointments. The meter or sensor app remains the source of truth, and the tracker does not interpret readings for you.

Consistency helps

Many people find it easier to manage glucose when meals contain similar amounts of carbohydrate from day to day. Saved meals in a tracker make that consistency easier: your usual breakfast with its known carbohydrate count is one tap.

Weight loss and diabetes

Losing weight can improve glucose control for many people with type 2 diabetes. If you take insulin or medicines that can cause hypoglycaemia, eating less can change what you need, so plan any calorie deficit with your care team rather than on your own.

What a tracker cannot do

A food tracker does not diagnose, predict your glucose, adjust your medication or replace your meter or continuous glucose monitor. Use it as a clear record to bring to appointments.

The bottom line

Count carbohydrate in grams or choices, keep meals consistent, log the time and, if you measure them, your glucose readings, and agree every target with your diabetes care team.