boltIn short
- A fasting reading and an HbA1c can both look fine while your glucose runs high after meals.
- A CGM shows which meals push you highest and how long the highs last.
- Change one thing at a time, and never change a medicine dose without your doctor.
For years, the main number most people with diabetes heard about was their fasting glucose, plus an HbA1c every few months. Both are useful. Neither tells you what happens after you eat, and that's where a lot of the day's highs come from.
What a fasting reading misses
A fasting reading is one moment, usually first thing in the morning. It can look fine even when your glucose climbs high after meals and stays up for hours. HbA1c is an average over roughly three months, so a high after lunch and a low overnight can cancel each other out and still look reasonable on paper.
What happens after a meal
Glucose normally rises after eating and comes back down within a couple of hours. How high it goes and how fast it falls depends on what you ate, how much, what you did afterwards, your medicines and even how well you slept. Two people can eat the same lunch and get very different curves.
For many adults with diabetes, guidelines suggest keeping glucose under about 180 mg/dL one to two hours after starting a meal. Your own target may be different, so check it with your doctor.
What a CGM shows you
A continuous glucose monitor, or CGM, is a small sensor worn on the arm or belly that reads your glucose every few minutes, day and night. Instead of a few dots on a chart, you see the whole line.
Which meals push you highest
It's often not the one you'd guess.
How long the highs last
A short spike that settles within two hours is very different from one that lingers all afternoon.
What happens overnight
Lows during sleep often go unnoticed without a sensor.
Time in range
The share of the day spent inside your target. Many people aim for 70% or more between 70 and 180 mg/dL, but your doctor will set yours.
Small changes that often help
- A 10 to 15 minute walk after your biggest meal
- Eating the vegetables and protein on your plate before the rice, bread or roti
- Splitting a large lunch into a smaller lunch and an afternoon snack
- Checking whether sweet drinks, including juice and sugary chai, are behind the spikes
Try one change at a time and look at the curve afterwards. That way you find out what works for you, which isn't always what works for someone else.
How your doctor uses it
When your doctor can see what happens after meals, they can make more precise decisions, like moving a dose to a different time of day instead of simply raising it. With Rucja, your CGM readings reach your care team as they're recorded, so these conversations can happen between appointments and not only at them.