Fruits and vegetables are essential for global nutrition and economic growth, yet they are among the most perishable food commodities, contributing to major postharvest losses worldwide. Freeze drying is widely recognized as a superior preservation method that maintains the structural integrity, nutritional value, and sensory quality of fresh produce. Despite its advantages, freeze drying is energy-intensive, posing challenges for cost-effectiveness and sustainability in large-scale applications. This review explores the freeze drying process in detail, highlighting the critical operational parameters such as freezing rate, chamber pressure, shelf temperature, and sample thickness, that influence both product quality and energy consumption. Additionally, the role of cryoprotectants in preserving bioactive compounds during drying is discussed. By identifying optimization strategies for these parameters, this study aims to support the development of more energy-efficient and economically viable freeze drying systems for the fruit and vegetable processing industry.

One of the consequences of poor nutritional management in toddlers is stunting. One nutritious alternative food to prevent stunting at a relatively cheaper price is sweet corn. Sweet corn is increasingly popular and widely consumed because it has a sweeter taste than regular corn (Kartika, 2019). Siswono (2004 in Surtinah, 2013) reported that the sugar content of the master sweet variety is 16 – 18%, close to the sugar content of cane, namely 19%. Sweet corn contains 96 cal Energy, 3.5 g Protein, 1.0 g Fat, 22.8 g Carbohydrates, 3.0 mg Calcium, 111 mg Phosphorus, 0.7 mg Iron, Vitamin A 400 SI, Vitamin B 0, 15 mg, Vitamin C 12.0 mg, and water 72.7 g Iskandar, 2006). This service activity was carried out at the Kampung Jawa Village Hall, Blangkejeren District, Gayo Lues Regency. The parties involved in this activity were lecturers from the Agrotechnology and Forestry study program, PSDKU Gayo Lues, Faculty of Agriculture, Syiah Kuala University as resource persons, as well as the Agrotechnology and Animal Husbandry study program, Faculty of Agriculture, Gunung Leuser University, Aceh Kutacane, village midwives as partners, village heads as facilitators and the village community. Javanese Village as a participant. Survey of activity locations, socialization of service activities, implementation of service activities, evaluation of service activities. The conclusions from this activity are: 1. Regarding the causes, characteristics, dangers and prevention of stunting by related parties, this is one of the first steps in efforts to improve the nutrition of pregnant women and toddlers in the Kampung Jawa Village community. 2. Sweet corn is an alternative food source that can be consumed by pregnant women and toddlers to prevent stunting. 3. This activity attracts the attention of mothers participating in socialization and Posyandu in Kampung Jawa Village and can increase their knowledge about preventing and handling stunting.

Kampung Manggis is a mangosteen producing area in Pauh, Padang city. When a large number of mangosteens are produced, but not all of them are sold by the mangosteen farmers, the remaining mangosteens will rot over time. The remaining mangosteen, which cannot be sold can be developed into various useful health products. The mangosteen peel contains various beneficial chemical ingredients, one of which is alpha mangostin. Based on various research results, it is stated that alpha mangostin has antioxidant activity. The community service which was held on June 23 2023 in Kampung Manggis as a service partner was the Permata Harapan farmer group. This community service is carried out by teaching how to make products from mangosteen peel processed into facial mask and body scrub products. From the processing of mangosteen peel, two products are produced which are made together with the community, namely a mangosteen skin facial mask and body scrub. Mangosteen farmers from the Permata Harapan farmer group can optimize the productivity of all the mangosteens harvested and no more mangosteens will become waste.