Is Diabetes related to bread consumption ?

So I have started now working with Dad on his diabetes reversal plan. My wife's Mama is also diabetic and yesterday over lunch we started working on his diabetes too. They both suffer from one similar problem : the need to eat bread. I am struggling to find ways to substitute this basic need. If you have a suggestions that you know please email me.

Why is bread bad ? Here is the explanation. Both people mentioned above are having brown bread. But if you look at this Harvard chart on Glycemic Index you will notice that White Bread and Whole Wheat Bread both have a GI of 71. There is a specific Whole grain bread mentioned which has a GI of 51. Now which bread does the brown bread of India belong to; I suspect it is on the higher side. Firstly it has no grains in it. I am even scared it may be white bread with coloring in it. But how to substitute it ?

Bread Choices at local Gurgaon Store. None of these had the same name as Harvard's "Whole grain bread"

My Dad was going to the factory, about 1.5 hrs away and he was going to pack the "usual" (a couple of tomato sandwiches). We came up with an alternative. Roti + a green vegetable like spinach subzi and a carrot subzi. Also he should have my juiceman's juice. He doesn't like salads too much so the fresh juice will give him the raw food benefits.

Could it be said that India's diabetes has grown with the consumption of bread ? People don't see it as any different than a chapati (GI of 30) but there's a HUGE difference. I wonder if the introduction of bread & white flour has led to an increase in diabetes in our population ?