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                               Dr Sampurna Roy MD         

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The role of nutrition in the pathogenesis of disease has been of great concern to scientists and physicians for many years.

The importance of nutrition has been understood by civilized societies for centuries.

Diseases that are consequences of inadequate diet have long plagued humankind.

Unfortunately, they remain with us today and most probably will be with us for years to come.

Historically, nutrition gained importance in medical science with the discoveries that the absence of essential nutrients, such as a single vitamin, induced a variety of important and specific nutritional deficiency diseases.

These important findings led to clearer understanding of how essential nutrients play vital roles in normal functioning of cells, tissues, and organs of animals and human.

As an introduction to malnutrition and deficiency diseases, it is essential to mention briefly the dietary components involved in normal and adequate nutrition.

The human body requires some 50 to 60 organic and inorganic compounds in quantities ranging from micrograms to grams.

These are included in six basic groups: protein, carbohydrates, fats, vitamins, minerals, and water.

Proteins are made up of amino acids, eight of which must be supplied by dietary intake because they cannot be synthesized by the body in the amounts needed.

These are isoleucine, leucine, lysine, methionine, phenylalanine, theonine, and valine. 

In addition, an exogenous supply of histidine is needed for early growth and development and therefore may be considered essential.

Carbohydrates in themselves are not essential, but they provide needed dietary calories.

Fats or their constituents fatty acids also provide needed dietary calories.

Vitamins, certain minerals and water are indispensable dietary components.

The consequences of the absence or imbalance of these components lead to malnutrition and deficiency states which has been briefly reviewed in this section. 

Each topic has been discussed in a separate page. More information will be added as I continue do update the site.



Pathology of Vitamin A deficiency


Importance of Vitamin A in our daily diet 


As a doctor today I prescribe Thiamine  (Vitamin B1) rich foods


Prevent Beriberi,Wernicke’s Encephalopathy, and Korsakoff’s Psychosis.



As a doctor today I prescribe  Riboflavin (Vitamin B2) rich foods to prevent mucocutaneous and ocular lesions



As a doctor today I prescribe Niacin (Vitamin B3) rich foods to eradicate Pellagra


Prevent the 4 Ds - Dermatitis ; Diarrhea ; Dementia and Death



Eat Citrus Fruits everyday and keep Scurvy away Pathology of Vitamin C Deficiency




As a doctor today I prescribe Vitamin K to prevent hemorrhage


The most important health problem of Vitamin K deficiency is Hemorrhagic Disease of the Newborn



As a doctor today I prescribe nutritious food for every hungry child  



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Dr  Sampurna Roy  MD

Consultant Histopathologist (Kolkata - India)







Infectious Disease Online


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Nutritional Pathology Online


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Soft Tissue Tumour Online


GI Path Online-India


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E-book - History of Medicine  


Microscope - Seeing the Unseen





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