Please post his current diet as that can help understand if it needs changes.
Normally a low carbohydrate diet may control his blood sugar. To understand why it's important to understand the underlying mechanism.
1. Carbohydrates are converted into blood glucose by our saliva and gut
2. As blood glucose/sugar levels rise, the pancreas produces insulin, a hormone that prompts cells to absorb blood sugar for energy or storage.
3. As cells absorb blood sugar, levels in the bloodstream begin to fall.
4. When this happens, the pancreas starts making glucagon, a hormone that signals the liver to start releasing stored sugar.
In a diabetic person, the pancreas does not produce enough insulin due to impaired beta cells. Due to this, the insulin levels don't rise enough to counter the rise in glucose levels.
Hence in Diabetic people, the blood sugar stays high. Carbohydrates cause an immediate spike in blood sugar followed by protein and very less in case of fat consumption.
Here is a comprehensive link to the metabolic process
2. Provide exogenous Insulin( which is the case with your dad).
Since #2 is not working well for your dad the doctor can change the dosage of his insulin or you can reduce his carbohydrate consumption. There are many schools of thought on how much carbohydrates to consume.
1. Virta Health. They recommend severe carbohydrate restriction to less than 25Gms per day. This causes nutritional ketosis and their study shows people have been able to reduce diabetes medications and insulin. They claim a. 94% of insulin users reduced or eliminated usage after 1 yrb. 60% of patients reversed their type 2 diabetes after 1 year*
2. Dr Hyman recommends Slow Carbs over low carbs. His philosophy is not all carbs are equal and some carbs are essential for the body. Plus Nutritional Ketosis is hard over a longer term. Here is his video drhyman.com/blog/2015/08/20...
3. Diabetely recommends a hybrid approach of many tracks based on Joslin Diabetes Center(Harvard Medical School). They recommend a combination of
1. Reduction in Simple Carbohydrate Consumption based on Low Carb High Fat diet
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