welcome to HCM,
Your husband is diabetic and his investigations there is anemia as for males this 11.9 gm is low and his platelet count
is high which is thrombocytosis
He must be seen by hematologist
to know the cause of anemia and platelet abnormality.
He has even WBC and RBC count which is low so a Proper work up with investigations like Bone marrow examination
and other parameters like serum iron,B12 level with blood film examined by hematologist would give clue to diagnosis and once diagnosis is made it can be treated.
It is not related to malnutrition
this may be some kind of hematological disorder or bone marrow suppression due to systemic disease,drug,alcohol or virus.