Assessing served portions plate waste and student acceptability in the Indonesian Free Nutritious Meal Program at a vocational high school

In the world of school nutrition, a meal is not truly successful just because it is placed on a tray. The real measure of success happens at the moment a student takes a bite, or decides not to. Programs that provide free, nutritious food to students aim to do more than simply fill stomachs; they aim to improve health, support learning, and teach better eating habits. However, there is often a gap between what is planned in a kitchen and what actually ends up being eaten. If a student receives a portion of vegetables but leaves them untouched, the nutrients never enter their body, and the resources used to grow and cook that food are wasted. This disconnect is known as plate waste, and it is a critical indicator of whether a feeding program is working. For a national initiative to be effective, the food must be served in the right amounts, taste good enough to be eaten, and be accepted by the students themselves.

In Indonesia, a major national strategy called the Free Nutritious Meal Program was launched to address these very issues, aiming to provide balanced lunches to students across the country. To understand how this program works in practice, a team of researchers from Universitas Pendidikan Indonesia conducted a detailed study at a vocational high school in West Java. They wanted to move beyond simple counts of how many meals were served and instead look at the entire journey of the food: from the moment it was weighed on the tray, to the moment it was finished or left behind, and finally to how the students felt about it. By tracking the same students over a full twenty-day menu cycle, the researchers could connect the dots between the size of the portion served, the amount of food wasted, and the students' personal preferences.

The study began by weighing every single component of the lunch before the students started eating. Using precise digital scales, the team measured the rice, the meat or fish, the plant-based side dishes, the vegetables, and the fruit. They then took photographs of the trays before and after the meal to see exactly how much food was left. At the same time, they asked the students to rate how much they liked each part of the meal. This approach allowed the researchers to see the full picture for each individual student, rather than just looking at averages that might hide important details. The goal was to find out which parts of the meal were being served correctly, which parts were being eaten, and which parts were being thrown away.

The results revealed a clear story about what works and what does not in the school cafeteria. The meat and fish dishes, as well as the rice, were the most successful components. Students ate nearly all of the animal-source dishes and the vast majority of the rice. However, the vegetables and plant-based side dishes told a different story. These items were the most likely to be left on the plate. In fact, for vegetables, the median amount eaten was zero, meaning that on a typical day, half of the students did not eat any vegetables at all. The plant-based dishes, which included items like tofu and tempeh, were also frequently wasted, with more than half of the portions left over.

A closer look at the data showed that the problem was not just about the students' willingness to eat, but also about how the food was prepared and served. The vegetables received the lowest ratings for taste, texture, and smell. Students described them as not tasting good enough or having a texture they disliked. The plant-based dishes showed a similar pattern; while some specific preparations like crispy tofu were popular, others like steamed tofu were often rejected. This suggests that the way the food is cooked matters more than the ingredient itself. Additionally, the researchers found that the portions of vegetables and plant-based dishes varied wildly from day to day, making it difficult for students to know what to expect.

Another interesting finding was that even though the fruit was the most liked item overall, with the highest satisfaction scores, a significant number of students still did not eat it. This indicates that even when students like a food in general, specific factors like the type of fruit, how ripe it is, or how it is served on a particular day can stop them from eating it. The study also highlighted that a large majority of students, nearly 90 percent, reported not finishing their meals at some point. Furthermore, more than 70 percent of students added their own condiments, such as extra chili or sauce, to make the food taste better. This heavy use of outside sauces suggests that the food provided by the program was often not seasoned strongly enough to satisfy the students' palates.

The researchers also checked if the school was serving the correct amounts of food according to the national guidelines. They found that while the meat and fish were served consistently, the rice portions were often smaller than the standard required. On average, the rice served was only about 71 percent of the target amount. This means that even though students were eating almost all of the rice they received, they were not getting the full nutritional benefit intended by the program because the initial portion was too small. The study concluded that to fix these issues, the program needs to focus on reformulating the vegetables and plant-based dishes to improve their taste and texture, while also ensuring that the rice portions are measured more accurately.

Ultimately, this study demonstrates that providing food is only the first step. For a school meal program to truly nourish students, the food must be served in the right quantities, prepared in a way that appeals to young people, and monitored closely to ensure nothing is wasted. The researchers found that by looking at the food from the perspective of the student—weighing what is served, seeing what is left, and listening to what they say—schools can identify exactly where the gaps are. The path forward involves adjusting recipes to match student preferences, standardizing portion sizes, and using student feedback to guide improvements. This approach ensures that the goal of the program is met: not just feeding students, but feeding them well.