For people from South Asian origin, diabetes and insulin were viewed as culturally unacceptable, making some patients reluctant to start insulin therapy or even admit to family and friends that they had the condition, researchers said.
"Not taking medicines - for whatever reason - can have a profound effect on patients' health and poor clinical outcomes for those withdiabetes and cardiovascular disease," said Dr Paramjit Gill, from the University of Birmingham'sInstitute of Applied Health Research.
South Asians in Britain are six times more likely than the general population to be affected with diabetes at a younger age and at greater risk of developing cardiovascular complications. Type 2 Diabetes is a major risk factor associated with heart disease.
Scientists recommend that South Asian patients would benefit from health professionals giving them tailored advice that highlights the long-term consequences of diabetes and cardiovascular disease (CVD).
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"Health beliefs found in South Asian diabetic patients are present in other chronic diseases such as rheumatoid arthritis. These health beliefs should be explored when consulting South Asian patients about using long-term medication," Dr Kanta Kumar, one of the researchers, said.
The study, published in the journal BMC Endocrine Disorders, found that some patients were concerned about increasing numbers of prescribed medicines being added to their treatment plans - compounding their fears about toxicity.
'felt fine' or their symptoms had become less severe. Others decided to stop their treatment during social gatherings - often stopping their medicines to take part fully in activities such as weddings.
The study foundmany patients of South Asian origin regarded medicines for treatment of diabetes and CVD as necessary.
However, patients who had migrated to the UK described the medicines they received in Britain as more effective than those they would have received in places like India and Pakistan.
Some patients used traditional and herbal remedies rather than 'Western' medicines, believing them to better at tackling illnesses without side effects. Family and friends were often important in deciding whether to take these medicines and, in some cases, would also supply them.
The findings suggest that if health professionals took patients' beliefs about medicines into account when prescribing, this would help them to better advise diabetes and CVD sufferers about the benefits of taking their medication on a regular basis.