Dar es Salaam, Aug. 1 -- ACROSS cities, grocery stores and supermarkets are mushrooming. They may differ in size, but they serve a similar purpose – offering a range of products to customers in a pleasant environment.

The shelves are usually neatly-arranged and superficially decorated with eye-catching, mouth-watering items.

Among these are various foodstuffs – from beverages to processed foods, chocolate, butter, sweets, and countless other snacks. Such delicious items dominate the shelves because many people, especially in urban areas, have little or no time to prepare fresh meals. It is a hallmark of contemporary lifestyle.

Most urban dwellers leave their homes in the early hours for work, only to spend two to four hours...