If you think grapes are just the boring bit of a lunchbox, it might be time to think again. Marks & Spencer has launched a limited-edition variety that’s already being talked about as the next big 'superfruit'.Called Boombites Red Berry Grapes, they may look like your standard plump, purple-black grape on the outside, but bite into them and you’ll discover a striking deep red pulp, more like a berry or cherry.They’re the result of a natural cross between a sweet table grape and a nutrient-rich red wine grape. The idea was to bring together the juicy taste of table grapes with the high nutrient profile of wine grapes, which are usually too bitter to eat.AdvertisementAdvertisementThat mix of flavour and nutrition is why they’re being billed as a 'superfruit' – these are fruits naturally rich in antioxidants and nutrients linked to benefits for heart health, immunity, and more.The grapes are available at M&S and Ocado for a limited time and cost £3 a box.So what makes them different, and how can they benefit your health? We asked a dietitian to tell us more.This will be on shelves for a limited time only. (Marks and Spencer).What are the potential health benefits of Boombites?While regular grapes have a white pulp, Boombites have a striking deep red centre. That colour comes from anthocyanins, a type of polyphenol (plant chemical) also found in blueberries and cranberries. These compounds act as antioxidants, helping to protect cells, reduce inflammation and support long-term health.AdvertisementAdvertisementNichola Ludlam-Raine, dietitian and member of the Red Berry Grape Advisory Board, tells Yahoo UK why else these unique grapes could be good for us:Packed with antioxidantsBoombites pack three times more resveratrol than blueberries. That’s the antioxidant in grape skins linked to protecting cells, calming inflammation and boosting heart health.“This compound… is one of the reasons why we think that people in France are often healthier than people in the UK. They've got better heart health despite their cheese-rich diet, because of this resveratrol, which is found in grape skins," Ludlam-Raine explains.Support gut health and immunityA large portion of the immune system sits in the gut, so what we eat plays a key role in how well it functions. "These grapes also help with gut health, and they help with the gut lining… 70% of our immune system resides in our gut. It's linked to mood, weight control, even skin health," says Ludlam-Raine.Help lower inflammation"The grapes help with inflammation, and help to keep our body within the status quo, working as it should," Ludlam-Raine explains. This could help to reduce the risk of cardiovascular disease and metabolic disease.It's the striking centre that gives these grapes an extra health kick. (Marks and Spencer)May reduce long-term disease riskAntioxidants like those in Boombites could also protect against cell damage and help reduce the risk of cancer, she adds. "Antioxidants protect against cancer. Just like fibre protects against colon cancer, antioxidants could reduce the risk of cancer in general."How to eat BoombitesLudlam-Raine says there are many different ways to mix Boombites into your daily meals or snacks.AdvertisementAdvertisementSnack ideas: "Of course, you can just enjoy them as a snack on their own, but you can add them to things like overnight oats or porridge with yoghurt and fruit."Smart combos: Pair with walnuts, dark chocolate and popcorn. "That is like 10x-ing your grapes, because you’ve got more polyphenols, more fibre, and some healthy fats."Classic pairings: Grapes and cheese remain a winning combination. For extra gut health, try kefir yoghurt with grapes, nuts or seeds.Add to meals: Slice into salads for sweetness, or freeze them to use as ice cubes in sparkling water.For parents, grapes should always be quartered for children under five to reduce choking risk. Ludlam-Raine says her own young children love them – even one fussy eater who refuses blueberries.Other superfruits to add to your five-a-dayLudlam-Raine also highlights other fruits worth working into your weekly shop:Blueberries – "They’re like the original superfruit, and they’re widely available in frozen format, so really accessible."Kiwis – a source of vitamin C, plus kiwi berries are a fun lunchbox addition.Cotton Candy grapes – green grapes that naturally taste like candy floss, loved by kids.Satsumas (easy peelers) – "They’re so versatile, you can just throw them in your bag. Nutrient-dense and widely accepted by kids."Read more about superfoods: