Emulsifiers are common in ultra processed foods, and a new study in the journal Cell Metabolism says those kinds of foods can cause people to gain more weight than unprocessed foods. Ultra processed, refers to food that have emulsifiers, high fructose corn syrup, flavoring agents and hydrogenated oils.
In the study, 10 healthy adults ate an ultra processed diet for 14 days. It included foods like baked potato chips, turkey bacon and bagels with cream cheese. Ten others ate an unprocessed diet, including oatmeal bananas, meats and walnuts. Then the two groups switched diets for another 14 days. The meals all had the same amount of calories, fat and carbohydrates, but participants were allowed to eat as much or as little as they wanted. They also exercised about the same amount each day.
The results? On the ultra processed diet, people ate faster and took more helping, consuming about 500 more calories per day than those on the unprocessed diet. With the ultra processed foods, they tended to gain about two pounds. With the unprocessed foods, they tended to lose about two pounds. So one big conclusion was that limiting the ultra processed foods we eat can help prevent obesity. But that's not always easy. Researchers say it takes less time to prepare the ultra processed foods and they cost less. A week of processed meals was estimated to be around $106. A week of more natural meals, $151. That may be why another study found that majority of the foods that Americans, Britains and Canadians eat is ultra processed.
乳化剂在超加工食品中很常见，《细胞代谢》期刊上发表的最新研究显示，与未加工食品相比，超加工食品可能更容易令人们体重增加。超加工食品指含有乳化剂、高果糖玉米糖浆、调味剂和氢化油的食物。
在这项研究中，10名健康的成年人连续14天食用超加工食品。他们的饮食包括烤土豆片、火鸡培根和奶酪百吉饼。另外10名健康的成年人则食用未加工食品，包括香蕉麦片、肉类和核桃。然后两组互换饮食，再继续食用14天。每一餐的卡路里、脂肪和碳水化合物的含量是相同的，不过参与者可以自行决定吃多少。另外，参与者每天的运动量也是一样的。
结果呢？就超加工食品来说，人们吃得又快又多，每天大约比未加工饮食多摄取500卡路里。食用超加工食品，人们的体重一般会增加2磅左右。而食用未加工食品，人们的体重则会减少2磅左右。这项研究的一个重要结论是，限制超加工食品的食用量有助于预防肥胖。但这并不容易。研究人员表示，超加工食品的准备时间更短，花费也更少。据估计，食用一周的加工食品大约花费106美元。而食用一周的天然食品则要花费151美元。这也许可以解释另一项研究的结果，该研究发现，美国人、英国人和加拿大人食用的食品大多是超加工食品。
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