Consuming a proper and balanced diet is necessary for each and every individual. It makes them fit, healthy, and keep them safe from chronic diseases. However, in today's world, many individuals frequently buy fast food without realising that the food may not provide all the daily nutrients that the body needs. Therefore, this study aims to propose a mathematical modelling on diet problem for the subways sets menu in Malaysia. The proposed mathematical model will be solved by using the Microsoft Excel Solver in order to produce optimal solution, which mean that the chosen menu from the Subway fulfil the daily requirements of calories, protein, carbohydrates, and fats for both men and women.

Nowadays, fast-food production is in high demand in the food industry. There are many fast-food restaurants in the world, such as Starbucks, McDonald’s, Kentucky Fried Chicken (KFC) and others. People would spend their time and money at fast-food restaurants because of their quick serving, convenience, and good taste. Starbucks is also no exception because it has various baked goods and hot breakfast items as part of its cafe menu. This can lead to people overconsuming the food at fast-food restaurants every day. Consequently, they would get health problems such as obesity, heart attack, diabetes and others. In this paper, we determine the most suitable menu from Starbucks for a day to fulfil the daily intake of calories, carbohydrates, protein, and fats for men and women. We will use the linear programming model approach to get the optimal calories, carbohydrates, proteins and fats for men and women. We used the nutritional value chart data from Starbucks’ menu, and this diet problem will be solved using an Excel solver. The results obtained fulfilled the required daily intake for men and women for calories, protein, carbohydrates, and fats from the Starbucks menu.