The cultivation of animal feed significantly affects global land use and resources, creating competition for arable land between livestock feed and human food production. At the same time, by-products from food production are often used in suboptimal processes like biogas production. Concentrate feed for pigs also does not fully meet their health and behavioral needs. To explore more sustainable and species-appropriate feeding practices, in this on-farm study eight groups of organic pigs were fed either with concentrate feed only, or supplementing part of the concentrate feed with vegetable and fruit scraps. This approach aimed to diversify their diet and reduce concentrate feed intake while offering an upcycling alternative for human food by-products. Results indicated that vegetable and fruit scraps contributed little to the pigs‘ energy and nutrient supply. This was highlighted by lower daily weight gains and lower weights in animals exposed to the vegetable-enriched diet. Nevertheless, this diet positively influenced animal welfare and health, leading to increased playfulness and reduced diarrhea, respectively. Therefore, incorporating vegetable and fruit scraps into pigs’ diet is a promising, yet to be optimized, approach towards increasing sustainability in the pork industry while enhancing animal welfare.