In her case it could be metabolic (or auto-immune), but not (weight driven), at least for her.

There is Two Sub-Types of Type 2 Diabetes (try and say that fast) where normal or even under-weight is "typical"

But just from the Genetics, if she has 3 first/second degree relatives that have diabetes (mom/dad/granny) that would leave her 7 to 8 times "more likely" to develop Type 2

So under age 40, her personal risk would be about 1 in 12 while the general population is 1 in 100

But given the (normal/under weight) sub-types are kinda rare (5% of T2's) I might be asking the Doc about ordering a GADA test to make sure it's not onset of LADA (Latent Auto-immune Diabetes in Adults) which typically sees onset from late teens to early 30's and initially presents as Type 2

The anti-body test is a simple blood draw and will confirm or rule out LADA and is worth checking in "apparent" Type 2 cases under age 35

If you visit www.medicinenet.com and ask the question"is diabetes inherited from the mother or the father" you will find some interesting percentages which may answer your question

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I'm not sure if I can explain it better. I guess what I'm asking is how high a percentage a person with both parents (and both grandmothers as well as their maternal great-grandmother and a maternal great-aunt) that isn't the slightest bit overweight has of becoming a diabetic herself?

If 6.5 is her blood sugar reading after a finger prick test it's pretty normal but if there's a hereditary genetic risk of diabetes to her a change of diet will give her a better chance of not getting it IE: folllow a low-medium G.I DIET, LOW CARB, HIGH FIBRE-PROTEIN- LOW FAT-LOW SALT-IRON RICH DIET.

Well to begin with @A DiabetesTeam Member gave you some great advice. I had gestational diabetes at 22, went away when my son was born at 46 returned as T2. My maternal grandmother, my paternal grandmother, my mother, myself, aunts and uncles are T2s. Also @A DiabetesTeam Member and @A DiabetesTeam Member are other examples how genetics plays a role in becoming T2. If you look at all the facts, I say she would have better than a 50/50 chance of developing it, not necessarily in her 20s. I try to tell my sons to be proactive, watch their diets, and exercise much as possible, luckily, they love hiking, they take me along occasionally. Being proactive really helps, hugs Joyce

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