UK Researchers Suggest Health Boost from Eating Fruit and Vegetable Scraps

According to BBC UK, UK researchers suggest that consuming fruit and vegetable scraps, including peels and stalks, may provide a health advantage that is currently overlooked. These scraps are identified as a source of dietary fibre, and the research encourages the practice of "root-to-tip" eating, which includes parts like watermelon rind, pineapple core, and butternut squash seeds.

Official data indicates that only 4% of adults meet the recommended 30g of fibre per day, despite fibre's known benefits for gut health. Fibre is stated to aid digestion, promote feelings of fullness for longer periods, and is associated with a reduced risk of heart disease and bowel cancer.

As a general guideline, the outer layers of fruits and vegetables contain more fibre than the edible inner sections. For instance, a kiwi consumed with its skin on provides 50% more fibre compared to one that has been peeled. The scientists at King's College London conducted a study analyzing 12 raw or uncooked fresh foods: beetroot, bell pepper, broccoli, butternut squash, cauliflower, celeriac, curly kale, fennel, kiwi fruit, leek, pineapple, and watermelon. They discovered that many discarded components held more fibre than the typical portions people consume.

Specific findings from the analysis included watermelon rind containing 2.10g of fibre per 100g, which is comparable to the fibre in a slice of wholemeal bread. Furthermore, butternut squash skin and seeds contained 9.25g per 100g, nearly matching the fibre content of a bowl of bran flakes, and pineapple skin and core held five times more fibre than the flesh.

Project lead Dr Rachel Gibson stated that the study's results imply that people are discarding a considerable amount of fibre. Dr Gibson also noted that this loss is not only nutritional but also financial, as consumers are effectively discarding a significant portion of what they have paid for.

King's College London has been conducting experiments in its canteen by offering staff and students root-to-tip meals, such as banana skin curry. The researchers advise that at home, individuals might consider leaving kiwi fruit skins on, incorporating broccoli stalks into stir-fries, or adding bell pepper seeds to meals. While cooking can alter fibre content, it generally does not eliminate it entirely, with steaming, microwaving, or quick sautéing being methods that tend to best preserve nutrients.

Dr Gibson emphasized that the goal is not to enforce perfection or compel people to eat food they find unappetizing, but rather to acknowledge the nutritional value present in components that society has conditioned people to discard. She acknowledged that some individuals might be hesitant to try these methods.

During the canteen trial, some diners expressed concerns. Over a nine-week duration, "root-to-tip" dishes accounted for one-third of the total daily hot menu sales at the university, and those who selected these new dishes were observed to be less likely to finish their meals than those eating from the standard menu.

Kirsten Jackson, a dietitian with the British Dietetic Association who specializes in irritable bowel syndrome (IBS), commented that these dietary adjustments are beneficial provided the produce is washed thoroughly. She suggested incorporating pineapple cores into smoothies but cautioned against recommending the tough skins. Jackson added that some stalks might require cooking or fine chopping to improve palatability, advising that instead of discarding them, one could chop and freeze them for use in future soups or stir-fries. She advised increasing fibre intake gradually to prevent bloating, especially for those with IBS.

Separately, the British Nutrition Foundation advised that certain items should be avoided entirely, noting that green potatoes and rhubarb leaves contain toxic compounds, and that tough seeds and stalks might not be appropriate for young children.