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Avatar universal

Why would a low carb diet drive up my fasting glucose and A1C?

I'm a 60-year old woman, weigh 105 lbs, exercise regularly.  I take meds for hypertension and cholesterol and I also take synthroid.  About 6 months ago I started a low carb diet for my overall health because heart disease is in my family.  I cut out processed foods, bread, white potatoes, pasta, crackers, candy, cereal, desserts.  My diet consists of salads with reduced fat dressings, salmon, chicken, tuna, occasional steak, green vegetables, occasional sweet potato, nuts, cottage cheese, greek yogurt and Atkins bars.  I recently had a blood test and my fasting blood sugar went from 87 to 96, and my A1C rose from 5.8 to 5.9.  I was shocked because my diet has not included simple carbs for the past 6 months.  Can you give me some insight as to what may be driving up my fasting gluclose and A1C if I'm not eating high carb foods?  I do not cheat on my diet and I exercise 3-4 days per week. I would be happy to adjust my diet again, but I'm at a loss as to what can be causing this.  Thank you.
18 Responses
141598 tn?1355675363
Your fasting levels are within normal range but your A1c says otherwise; 5.8%=120 mg/dl, and 5.9%=123 mg/dl. Both are prediabetes and tip-toeing closely to diabetes land.

What "meds for hypertension and cholesterol" are you taking? We can search to see if possible drug interaction/s are taking place. Drug interactions may/can elevate glucose levels.

It's important to read nutrition labels carefully. Many salad dressings contain large amounts of sugar, most are listed under carbohydrates in grams. Every 7 grams equals one heaping tablespoon of sugar. Although Greek yogurt is low in carbs, carb sugars can average 5 grams per serving [2/3 cup]. However, if you consume yogurt as part of your pre-workout regimen you may be able to burn of the carbs and sugar as energy. The only way to know is by testing after your post exercise rest down period. You do have a home glucose test meter, right?

This is an excellent web site to look up nutritional data on all foods you consume. Search Atkins bars by name followed by the word 'nutrition'. Some have zero sugars others up to 5 grams.

Good luck -
Avatar universal
Thanks, WaveRider.  I just ordered a glucose meter on the Internet and will start testing to see what's driving up my glucose.  You're right about the salad dressings.....I checked them out and one of my favorites which is Lite Raspberry Vinagrette has 6 grams of sugar per serving.  I was wary about the yogurts which have 15 grams of sugar per serving.  The Atkins bars all say 'low glycemic index' so I never questioned those.  I'm just surprised that after giving up a diet packed with simple carbs and processed foods for a diet that I perceived to be almost carb free, that my sugar would go up.  Another explanation could be that it is in my family....my brother has had diabetes for the past 20 years, my maternal grandmother had it, and my fraternal twin has an A1c that hovers around 6.1.  Thanks again...I'm looking forward to learning more when I receive the meter.
Avatar universal
I forgot to tell you my blood pressure meds.  I've been taking Lotrel 5/20 for years (Amlodipine 5/Benazepril 20) and within the last year added 25 mg Spironolactone (potassium sparing diuretic).  Also around the same time I started the "low carb" diet, I started taking 500 mg of SloNiacin, which I know can cause an increase in glucose.  However, I am taking a relatively low dose.  If this is being caused by my meds, there's really nothing I can do, correct?  I'm very restricted as to what meds I can take due to allergies and side effects.
141598 tn?1355675363
You're welcome Ruthiejb. Also, watch out for hidden sugars like dextrose [a carb sugar], sucrose, fructose [fruit sugar] and HFCS [made from corn starch]. Eat fruits with other foods to slow the absorption of fructose. Understand which fruits are low in fructose and which ones that are way high on the do not eat list.

I don't get the SloNiacin. Niacin is a B3 and is known to elevate blood sugars. You can control cholesterol through proper nutrition. Use Google search on 'foods that may raise cholesterol' then avoid them, like ground turkey.

With regular exercise it is important to adjust your carb intake accordingly. It's a catch-22; carbs raise blood sugars but at the same time we need carbs [glycogen from the liver] for energy. This is why testing is very important to understand how much carbs your body can take. Test times are:

· preprandial - b4 a meal to get a baseline measurement
· postprandial - 2-3 hours after eating to see how the foods you ate affected your levels. Compare against preprandial
· B4 exercise - like preprandial gives you a baseline measurement
· 30-40 minutes after exercise [rest down or cool down period] - presents a good insight on how much blood sugar you burnt off.

Lotrel - may raise blood sugars
Spironolactone - may raise blood sugars
If these elevated your blood sugars you would have seen that a long time ago. Instead, concentrate on proper nutrition and continue with the exercising. Good luck -

231441 tn?1333896366

as seen above there may be hidden carbs in your diet.  However, I would be more inclined to think that you may be prone to developing diabetes anyway and it is just slowly progressing.

For your diet, it seems you are trying to eat low carb and low fat.  You may feel better and more satisfied if you add some more healthy fats to your diet.  Heathy fats include olive oil (you can make your own salad dressing this way), avocado, nuts, fats from meat (generally choose leaner cuts of meat, but eat the fat that then comes with the meat), cheese, full fat (unsweetened) dairy, fish.

You could ask your doctor about starting metformin.  It is often a first line drug in early diabetes and may help stop it progressing further.

Best wishes

Avatar universal
I do appreciate your advice.  WaveRider, thank you for the testing times....I know nothing about it and will have to learn.  Unfortunately, high cholesterol also runs in my family and I need the medicines.  My doctor is unconcerned; we communicated via e-mail and when I expressed my concern over the 5.9 A1c, his response was, "it's an acceptable A1c, just watch for trends."  Well, it's trending up!  I'm just very frustrated because I thought I was really doing everything right as far as diet and exercise.  I get a lot of grief from (nosy) friends about being underweight; I did lose weight when I changed my diet; I wasn't trying to and I didn't really have to.  Sally, I appreciate the food advice and I'm thinkiing you're right that I'm slowly moving towards diabetes.  My husband takes Metformin (not for diabetes but for metabolic syndrome), and depending on my next blood test in September, I will talk to my doctor about taking it too.  By the way, I looked at the ingredients in my salad dressings and I found that most contain "maltodextrin" which I read was worse than sugar for driving up blood sugars.  I'm glad I'm learning.  Thanks again and best wishes.
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231441 tn?1333896366
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