Fortune | FORTUNE 10月02日 02:08
了解身体所需的蛋白质摄入量
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蛋白质是身体必需的三大宏量营养素之一,对修复肌肉、骨骼和细胞至关重要。身体由约10,000种不同的蛋白质构成,它们维持着我们的正常功能。蛋白质由氨基酸链组成,其中九种必需氨基酸身体无法自行合成,因此需要从食物中获取。每日蛋白质摄入量因年龄、活动水平和体重而异,同时受共食营养素影响,并非简单地多吃肉类就能满足。一般建议健康成年人每公斤体重摄入约0.8克蛋白质,或体重(磅)乘以0.36。每日总热量摄入的10%-35%应为蛋白质。专家建议,与其纠结计算,不如专注于全天摄入富含蛋白质的食物,并搭配水果、蔬菜、谷物和奶制品。

⚖️ **个体化蛋白质需求**:蛋白质的每日摄入量并非一成不变,它受到多种因素的影响,包括个人的年龄、体重、活动水平,甚至是伴随蛋白质摄入的其他营养素。对于大多数健康成年人,每公斤体重摄入0.8克蛋白质是一个普遍的参考值,但具体需求可能因个体差异而有所不同。例如,对于一个体重170磅的人,每日约需62克蛋白质。

📈 **年龄与运动对蛋白质需求的影响**:随着年龄增长,特别是从30岁开始,肌肉质量会逐渐减少(肌少症)。研究表明,老年人可能需要增加蛋白质摄入量来对抗肌肉流失,一些专家建议40岁以上人群将蛋白质摄入量提高至每公斤体重1至1.2克。对于经常进行力量训练的活跃人群,为了支持肌肉的构建和修复,建议将蛋白质摄入量提高至每公斤体重1.2至2克,并将其分布在全天,尤其是在运动后。

🌿 **优质蛋白质的选择与摄入时机**:选择蛋白质来源时,应优先考虑低饱和脂肪且未过度加工的食物,以保留其核心营养素。例如,豆类富含蛋白质和纤维,消化缓慢,能提供更持久的饱腹感。其他优质选择包括瘦肉、鱼类、禽类、鸡蛋、坚果、种子和豆制品。为了最大化蛋白质的益处,如维持肌肉质量,建议将蛋白质摄入量均匀分布在全天,而不是集中在一餐中,因为大多数人倾向于在晚餐摄入大部分蛋白质。

Protein, one of three types of macronutrients, helps our bodies repair the muscles, bones, and cells vital to keeping our bodies structurally intact. In fact, we are made up of roughly 10,000 various proteins that help us function. Protein is made up of chains of amino acids, and because the nine essential amino acids are not made by the body, we must get protein from food. 

But how much protein do we actually need every day? Ideal protein intake varies by age, activity level, and weight. It also depends on the nutrients consumed alongside a protein source, so it may be more complex than merely packing in a sirloin steak or a load of lunch meat and calling it a day. 

How much protein is enough? 

The general recommendation is that most healthy adults need about 0.8 grams of protein per kilogram of body weight. You can also multiply your weight in pounds by 0.36 to calculate the rounded ideal number of grams. For example, a person who weighs 170 pounds would need around 62 grams of protein per day or about 69 grams for someone who weighs 190 pounds. 

Anywhere from 10% to 35% of your daily caloric intake should be protein, according to the National Academy of Medicine: a wide range that underscores how protein intake varies greatly depending on the individual. 

Rather than getting caught up in complicated calculations, some experts say to just focus on eating protein-rich foods throughout the day, such as seafood, lean meats, poultry, eggs, legumes, nuts, seeds, and soy products. Incorporating protein throughout your day, along with a balance of fruits, vegetables, grains, and dairy may be an easier to way think about it. 

Additionally, the recommended daily allowance of protein is not a “one size fits all” approach, Siera Holley, a registered dietician at the Ohio State University Wexner Medical Center, tells Fortune. Factors such as pregnancy, amount of exercise, and age all may play a factor in how much protein people should aim for, she says. 

How much protein do you need as you age? 

Muscle mass begins to reduce starting in your thirties. Known as sarcopenia, it’s “the age-associated loss of muscle mass and function,” says Roger Fielding, senior scientist in nutrition, exercise physiology, and sarcopenia at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University. The general recommendation may not account for the fact that older adults need more protein to counter this muscle loss. Studies have shown a correlation between increased protein intake for older adults and improved cognitive function and physical health

Roughly 50% of women and 30% of men 71 and older don’t get enough protein, according to the 2020–2025 dietary guidelines. As you age and muscle mass begins to shrink, some experts recommend increasing protein intake to 1–1.2 grams of protein per kilogram of body weight beginning at age 40. To do this, you can even incorporate a protein powder or mass gainer into your diet.

How much protein do you need if you exercise regularly? 

Activity level can also alter how much protein you need to build and repair muscles. If you’re active and do strength training, consuming more protein post workout makes sense, Fielding says. 

For those regularly active, consider upping protein intake to 1.2 to 2 grams per kilogram of body weight. This protein should be spaced out during the day, with a prioritization of carbohydrates and protein following exercise. 

What’s the best type of protein? 

Don’t just think about eating more meat. Consider proteins that are not high in saturated fats and not highly processed, which can strip them of core nutrients.

Legumes provide protein and are rich in fiber, so they are digested slower and make you feel more satisfied and full, for example. This is why the protein “package” matters—the host of qualities within a protein that determines how healthy it is. Consider lean meats, plant-based meats, and seafood as well. 

Protein-rich foods:

    Salmon: 27 grams of protein for a 5-oz. salmonLean chicken breast: 54 grams of protein for a 6-oz. lean chicken breast Whitefish: 38 grams of protein for one filet of whitefishTurkey breast: 29 grams of protein for 3½ oz of turkey breast 

Vegetarian protein-rich foods:   

    Lentils: 12 grams of protein for ½ cup of lentils Greek yogurt: 15-20 grams of protein for a 6-oz. cup of yogurtEggs: 6-8 grams of protein in one egg Chickpeas (garbanzo beans): 14.5 grams of protein for one cup of chickpeas 

When’s the best time to have protein? 

Protein can help decrease hunger because it metabolizes slowly. Therefore, spreading protein intake throughout the day is beneficial. 

“Studies have shown that most people consume the bulk of their dietary protein at the evening meal, with far less being consumed at breakfast and lunch,” Fielding says. “There is evidence that the distribution of protein intake throughout the day may be better for maintenance of muscle mass than consuming the majority of protein at one meal.” 

Is there such a thing as too much protein? 

It is indeed possible to eat too much protein. Excess protein can lead to bad breath, heart disease, and kidney disease. For those with kidney disease already, or at higher risk for the disease, too much protein can be harmful, so you should talk to your doctor to understand your protein needs. 

While there isn’t a specific limit, it’s important to spread protein throughout the day and choose lean sources that are not high in saturated fats. A diet rich in red meats can raise your risk of heart disease and colon cancer

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蛋白质 营养 健康 饮食 Protein Nutrition Health Diet
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