Type 1 and BG's suddenly dropping immediately after eating

AliceBee

Member
Messages
8
Type of diabetes
Type 1
Treatment type
Pump
I have been Type 1 for 30 years and currently on a closed loop pump. The last few weeks I have had to delay taking my bolus insulin due to bg's dropping immediately after eating and and going hypo. Previously I would bolus about 10 mins before eating with no issue. I then tried bolusing immediately before eating and the same thing happens. There have been no changes in activity levels, diet etc that I can think of to explain it. It is very strange and is almost as if my body is releasing insulin as soon as I eat, which I know is not possible. BG's do start to rise but not until about an hour after eating.
Have any other type 1's experienced similar and was any cause identified?
 

Nicola M

Moderator
Staff Member
Moderator
Messages
882
Type of diabetes
Type 1
Treatment type
Pump
Hi @AliceBee

A couple of questions which may help people assist you with this;

What Insulin pump and CGM are you using?

What Insulin are you using?
 

AliceBee

Member
Messages
8
Type of diabetes
Type 1
Treatment type
Pump
Pump is Medtronic 780g with Guardian 4 sensors. Insulin is Novarapid. I have been on this pump and insulin since early 2024 which is why I didn't mention it.
 

Nicola M

Moderator
Staff Member
Moderator
Messages
882
Type of diabetes
Type 1
Treatment type
Pump
I am on the 780g, the only time I've ever had this happen is when I am already on the low side (5.0 and lower range) and the insulin has kicked in before my food has, if I'm ever below 5 I'll usually delay giving my insulin to give the food time to hit my system but I am also on Lyumjev which kicks in quicker anyway, the only settings you can really play around with to see if it makes any difference is AIT or Carb Ratios, although I personally wouldn't do this without speaking to my diabetes team first. Tagging a couple of others who also use the 780g who may have more experience with this situation @Prancy @searley
 

Hopeful34

Well-Known Member
Messages
2,178
Type of diabetes
Type 1
Treatment type
Pump
BG's do start to rise but not until about an hour after eating.
Do you go low if you don't eat till later, just wondered if your basal rate had changed? It's probably worth doing a fasting basal rate check, if you haven't already.

It depends what you're eating. If the meal contains a fair bit of fat that would slow down the absorption of carbs, eg pizza, pasta with a sauce etc.

Diabetes can cause slower transit of food in the gut, so that's another possibility. Are you going low with other meals?
 

Tony337

Well-Known Member
Messages
828
Type of diabetes
Type 1
Treatment type
Insulin
Dislikes
Not being on holiday....
Hi
If i have been v active i often eat first them take my novorapid later otherwise i end up feeling grim.

Insulin sensitivity can strike just like resistance can but with me its activity that affects sensitivity more often than not.

50 years a type 1 who takes less insulin now than i ever have done.

Good luck

Tony
 

T1D-USER

Newbie
Messages
1
Type of diabetes
Type 1
Treatment type
Insulin
I have been Type 1 for 30 years and currently on a closed loop pump. The last few weeks I have had to delay taking my bolus insulin due to bg's dropping immediately after eating and and going hypo. BG's do start to rise but not until about an hour after eating.
Have any other type 1's experienced similar and was any cause identified?
Hi Alice, I am having a similar issue, although I don’t use a pump I am using Novorapid.

I am using the libre freestyle 2 cgm to monitor my glucose and notice this same thing happens to me randomly.

I inject Novorapid, eat dinner ( almost always happens at dinner time ) and after half an hour my bg starts dropping rapidly.

I have worked out if drink apple juice 400ml it stops it very quickly and I don’t go low.
In fact it doesn’t even spike my blood sugar just stabilises it.

Like you I would love to know what causes this. The carb count is correct and a regular meal, but I suddenly need only half the insulin, but only for one meal and back to normal again.
 
Last edited:

BlueBerry11

Member
Messages
16
Type of diabetes
LADA
Treatment type
Insulin
I have had this over the last several days. Absolutely no clue why, wondering if I might be getting ill?

I was wondering if you’re still struggling with this and if you found an explanation?