You can’t believe the nutrition you read
The beginning of the New Year in S, millions of people have vowed to shape their eating habits. This usually involves categorizing food into moral categories: good/bad, healthy/unhealthy, nutrition/intemperate, weight loss/weight gain – but which foods belong to you, depending on whom you ask.
In the U.S. dietary guidelines advisory committee has released its latest guide, it defines a healthy diet as a emphasizes vegetables, fruits, whole grains, low-fat or nonfat dairy products, seafood, beans and nuts, and less red meat and processed meat, refined grains, and sugary foods and drinks. 1 some heart disease experts recommend a Mediterranean diet rich in olive oil, the American diabetes association agree that low-carbohydrate diets and low-fat diets, and doctors responsibility medical board for a vegetarian diet. Ask a robust CrossFit lover who might support the “Paleo” diet based on the food our paleolithic ancestors (reportedly) ate. My colleague, Walt Hickey, swears by keto.
Who is right? It’s hard to say. When it comes to nutrition, everyone has opinions. No one has a closed situation. The problem begins with a lack of consensus on diet. The goal is to make you slim? Build muscle? Keep your bones strong? Or to prevent heart attacks or cancer, or to keep dementia? No matter what you worry about, there is no shortage of food or food to help you. It’s very simple to associate eating habits with individual food and health factors – it’s ridiculous – as you’ll soon see from our small experiment.
Our research on nutrition science shows that research into how food affects health is essentially filled. To tell you why, we’ll take you behind the scenes to see how the research is done. First, you need to know is that nutrition researchers are studying an incredibly difficult problem, because they have no lock people in a room, all food is carefully taken into account, it is difficult to know exactly what people eat. So almost all nutrition research relies on measurement of food consumption, which requires people to remember and report what they eat. The most common are food diaries, recall surveys and food frequency questionnaires, or FFQ.
There are several versions of FFQ, but they all use similar techniques: ask people how often they eat certain foods, and how much they usually eat. But remember everything you eat, and even what you ate yesterday was not easy. People tend to underestimate what they consume, and they may not eat certain foods, or may incorrectly calculate their portions.
NutritionQuest, chief executive of Torin Block, said: “the bottom line here is dietary assessment, which is carried out by FFQ company, by his mother Gladys Block, the pioneer of the field, he began in the development of the national cancer institute food frequency questionnaire. “You can’t get rid of this problem – it involves mistakes,” he said. Still, there is a pecking order in completeness. A food diary ranked, 24 hour food recall, too, in the process, managers will this topic lead down to interview, will be eaten in the past 24 hours everything listed in the directory. But, says bullock, “you really need to do more than one administration to assess someone’s regular long-term dietary intake.” For research purposes, researchers don’t usually just focus on what they eat yesterday or the day before, but what they eat regularly. Studies using 24 hours of memory tend to underestimate or overestimate the nutrients that people don’t eat every day, because they only record a small number of snapshots that may not be representative.
When I try to keep a food diary for seven days, I found how right – when you only collect Block is a few days of the data, the records of the capture a reflect normal diet model is very difficult. I happen to be attending a meeting during my diary week, so the snacks and restaurants I eat vary greatly from the food I usually eat at home. My diary shows that one day before dinner, I just had a doughnut and two snack chips. What did I have for dinner? I can tell you this is a delicious Indonesian seafood curry, but I can’t start listing all the ingredients.
Another lesson of keeping a food diary for a short time is that keeping track of absolute behavior can change what you eat. When I knew I had to write it down, I pay more attention to how much I ate things, sometimes it means that I choose not to eat, because I’m too lazy to write it down or realize it, no, really want to the second donuts (or don’t want to admit that to eat it).
It’s not easy to avoid the human instinct to hide what we eat, but FFQ aims to overcome the unrepresentative of short-term food records by assessing people’s long-term consumption of food. When you read a title that says “blueberries prevent memory loss,” the evidence is usually from some version of FFQ. Questionnaires usually asked about the subjects in the past three, six, and twelve months.
In order to understand how these survey work, and how the reliability of the survey, we hire a Block to manage his company for a period of six months FFQ, my colleague Anna Barry – Jester and Walt Hickey volunteers and a group of readers. 2
Some questions – how often do you drink coffee? -easy. Others are also troubling us. Tomatoes. How often do I eat in six months? In September, when my garden was full, I ate cherry tomatoes and ate candy like a child. I can also eat two or three large purple cherokes daily, with balsam and olive oil. But I can go to November to July and not eat a fresh tomato. So how do I answer this question?
The question of portion size bothers us all. In some cases, the survey provides a strange but useful guide – for example, it depicts half a cup, a cup or two of yogurt, and looks like a picture of a bowl full of sawdust. Other questions seem absurd. “Who on this planet knows what a salmon or two chops look like?” ‘asked walter.