Brief Answer:
diet and exercise to avoid diabetes

Detailed Answer:
Hi sir i had go through your question and understand your concern.
i am very sorry about the condition of your wife.The good news is progression of prediabetes to diabetes can be slowed down and also stopped.
there are some important steps you need to follow in pre diabetes to slow down its progression
A).The most important is regarding weight maintenance.its advisable to go for daily exercise to maintain your BMI at below 24.
By doing exercises you can effectively reduce Insulin Resistance,which is very important contributing factor for onset of diabetes.
B).when it comes to diet,its very important to maintain balanced and timely diet schedule.Diet in diabetes should contain 60-65% of carbs. 20% of proteins and 20-15%of fats.
as you rightly said brown rice can be taken in diabetes but should be limited to a cup.Most of bread made out of whole wheat can be taken in diabetes.
This brown rice and whole wheat contain the same amount of glucose as normal white rice but the realize of glucose will be slow due to presence of fiber in them.
This kind of slow realize will prevent the rapid raise of glucose in your body.
Nuts are very good in diabetes and can be take daily in a quantity of small cup or you can take them not more than 50-75 grams.
This nuts should be a mix of walnuts,almonds,hazelnuts,peanuts and cashew nuts.
its better to prefer low fat milk than full cream milk.
I would like to give some diet tips to be followed in Pre diabetes
1.Avoid all kinds of refined carbohydrates like sugar
2.Take all kind of fresh veggies kindly restrict use of potato and sweet potato.
3.Daily taking green tea is good for pre diabetes as it contains lots of antioxidents
4.alcohol can be taken in a moderate quantity,Try avoiding wine and beer(better to avoid alcohol fully during gout attacks).Alcohol can be taken 2-3 ounces if your not having attack.
5. avoid all kinds of carbonated drinks they are not good for your bone health.
6.low fat milk can be consumed about 200ml per day
7.low fat cheese and low fat yogurt can be taken.
8. daily you can take a small cup of almonds,walnuts,pista and peanuts which are good for your good cholesterol.
9.daily take only one fruit,avoid banana and XXXXXXX ...if you like take only minimal quantity
10.you can take protein,Choosing plant-based protein, such as beans and legumes more.
11.alternate days you can take 2 egg white...pls discard yolk(yellow) since it contains bad cholesterol
12.use olive and sunflower oil for cooking.
13.prefer grill than oil fry.
14.occasionally you can take ice creams and dark chocolate
15.take good amount of green leaf veggies to avoid constipation
16.Animal proteins are high in purine. Avoid or severely limit high-purine foods, such as organ meats, herring, anchovies and mackerel. Red meat (beef, pork and lamb), fatty fish and seafood (tuna, shrimp, lobster and scallops) are associated with increased risk of gout. Because all meat, poultry and fish contain purines, limit your intake to 4 to 6 ounces (113 to 170 grams) daily.
17.It is best to avoid beverages sweetened with high-fructose corn syrup, such as soft drinks or juice drinks they will increase gout related problems.
this steps can stop your progression from prediabetes to diabetes.
in our web site healthcaremagic.com you can find most of the information regarding diet and other complications in diabetes.
kindly mention height and weight of your wife to advise calories per day.
Hope I was able to help you.
If you have any further question fell free to write me back.I will be happy to help.
Take care.
Best Regards.
Dr Vamsi Krishna
Consultant Diabetologist
Apollo Hospitals

---