<s>[INST] Low energy, which is variable, joint aches, particularly knees and ankles, vision often blurs and becomes tunnelled during bouts of low energy, trouble concentrating in these periods, blood test show borderline type 2 diabetes with a family history.  Had flu about 6 weeks ago, never really recovered. [/INST] Hello, Thanks for the query. If you have diabetes then it is necessary to control the excess glucose level, then only you will feel energetic. If FBG is 108 to 125 mg, PP 141 to 199 mg and HbA1c% is But if you already have FBG 126 mg and above, PP 200 mg and above as well as HbA1c% 6.5 and above, then diabetes is confirmed. In such a situation excess glucose lost through urine causes loss of energy and tiredness and feeling low in energy. Since you have not mentioned any relevant details it is difficult comment very specifically. Even the attack of flu also adds to the weakness as it takes a bit longer to recover full normalcy after an attack of flu. So my advice is if you have diabetes then start the treatment straight away. Once blood glucose is well controlled, you will be better. Thanks. </s>