There are plenty of myths and misconceptions when it comes to dietary protein.…
How much protein do I need?
Is it possible to eat too much protein?
Can vegans get enough protein?
Does a vegan or a vegetarian need to combine proteins?
What are the best sources of protein?
How much extra protein do I need if I work out?
First, let’s look at …
How much protein do I need?
1. The Recommended Daily Allowance (RDA) for protein is 0.36 grams of protein per pound of ideal body weight. (If you are overweight, you should use your ideal weight for calculations.) This works out to be about 10% of the total calorie intake.
Many experts believe this figure to be influenced politically and not based on sound research, and reports from peer-reviewed literature suggest the need is much lower. In fact, some studies have shown that any amounts over 30 grams daily gets expelled from the body.
The World Health Organization recommends much less.
At the very least, the RDA value has a large margin of safety, and the body’s true need is much lower for most people.
For the sake of argument let’s assume we do indeed need as much as 0.36 grams of protein per pound of ideal body weight. What does this mean to you?
Doing the Math
How many grams of protein should you eat if you need 0.36 grams of protein per pound of ideal body weight?
1. First you need to determine your healthy body weight. How do you determine your ideal body weight? (Ideal body weight will vary from person to person. This is just a general guide.)
If you are a woman, start with 108 pounds for the first 5 feet of your height. Then add 3.75 pounds for each additional inch.
If you are a man, start with 115 pounds for the first 5 feet. Then add 4.2 pounds for each additional inch.
The average American female is about 5 feet 4 inches tall, so her ideal body weight for that height is 123 pounds.
The average height of an American male is 5 feet 10 inches. The ideal body weight for that height is 157 pounds.
2. Next multiply your ideal weight by 0.36 to get the grams of protein you should eat daily.
So, if you are a 5′ 4″ female, your ideal body weight is about 123 pounds, and you will need 44 grams protein daily. (As I mentioned above, many experts believe this figure is too high.)
If you are a 5′ 10″ male, your ideal body weight is about 157 pounds, and you will need 56.5 grams protein daily.
Is it difficult to get this much protein? Well, let’s take a look …
How much protein does the average person eat?
The National Health and Nutrition Examination Survey found that the average American female about 70 grams of protein daily. This is 26 grams more than the recommendation that many researchers feel is already too high.
The same survey found the average American male consumes about 102 grams of protein per day. This is almost twice as much as the RDA.
Is it okay to eat more protein than your body needs? Are there health risks from eating too much protein?
If a little is good, more is better, right?
Not with protein. Once you’ve met your needs, it is a burden to the body to dispose of the extra.
Here are just a few of the damaging effects of excess protein consumption:
Bone loss and osteoporosis – High dietary protein intake encourages urinary calcium loss.
Many high-protein foods are high in sulfur-containing amino acids, which means they are highly acidic. This acid must be neutralized by the body. To neutralize the acids, minerals are released from the bones and into the bloodstream and then filtered through the kidneys into the urine.
Statistics reveal that rates of hip fractures increase with increasing animal protein consumption. For example, people from the USA, Canada, Norway, Sweden, Australia, and New Zealand are the largest consumers of protein and they also have the highest rates of osteoporosis. The lowest rates osteoporosis are among people groups who eat low-protein diets. (Ironically these people also consume very little calcium.)
Studies show that for every 10 grams of dietary protein in excess of 30 grams daily, the daily urinary calcium loss is increased by 16 mg.
Kidney stones – Once released from the bones, the bone minerals move through the blood stream to the kidneys where they are eliminated in the urine. When this bone material arrives in the collecting systems of the kidney it precipitates into sold formations known as kidney stones.
Over 90% of kidney stones (in the U.S.) are formed primarily of bone-derived calcium.
Researchers have found when people added about 5 ounces of fish (about 34 grams of protein) to a normal diet, the risk of forming urinary tract stones increased by as much as 250 percent.
Gallstones – Many studies show that high protein diets nearly double the risk of gallstones in women as compared to plant-based diets.
Mood swings and poor cognitive function – When we reduce healthy carbohydrates (which is inevitable when we increase protein intake), we reduce the primary fuel source for our brain and nervous system. In addition, a high-protein diet reduces serotonin levels – which can cause irritability and brain fog.
In one study, women on a high-protein diet scored significantly lower on memory-based tasks compared with women who ate a lower protein diet. When the high protein group reduced their protein intake, their cognitive skills improved.
Bowel disorders – Since eating too much protein inevitably displaces healthy carbohydrates in the diet and fiber is a carbohydrate, too much protein equates not enough fiber. Insufficient fiber often causes bowel disorders.
Accelerated Aging – Too much protein causes our bodies to age faster.
Heart Disease – High levels of homocysteine is a by-product of protein metabolism and an independent risk factor for heart disease.
Kidney Disease – Excess protein places a strain on the kidneys as they have to expel the extra nitrogen and other waste products of excess protein through urine.
Liver Stress – When you eat protein, your body produces ammonia, a toxin that your liver must process. Eating too much protein over a long period of time can cause your liver to become overworked.
High Cortisol Levels – The acidic condition created by a diet of too much protein raises cortisol levels. Elevated cortisol causes chronic bone loss – just like giving steroid medication for arthritis causes osteoporosis.
Cancer – One study found that eating a high-protein diet during middle age increases the risk of dying from cancer by more than four times, compared to eating a low-protein diet.
Gout – Foods high in protein increase levels of uric acid in the blood thus increasing risk of gout.
Insulin resistance and diabetes – When the body senses a lack of dietary glucose, peripheral insulin resistance is triggered. This prevents the muscles from taking up precious glucose that the brain requires.
In addition, an overload of amino acids has been shown to cause changes at the cellular level that can lead to insulin resistance.
One study found that those on a high protein diet had a 5-fold increase risk of death related to diabetes.
A recent randomized clinical trial showed that a low-fat diet that was high in healthy carbohydrates outperformed the American Diabetes Association’s standard dietary recommendations for people with type 2 diabetes. The subjects assigned to the high-carbohydrate diet lost more weight, had better laboratory values (including lower HbA1c and LDL cholesterol), and were more likely to be able to discontinue taking at least one of their prescription medications.
Another study reported in the American Journal of Clinical Nutrition showed that when fed in equal amounts (in calories), beef raises insulin more than whole grain pasta, cheese more than white pasta, and fish more than oatmeal.
Another study reported in the American Journal of Cardiology showed that insulin levels in type 2 diabetics and people with insulin resistance were reduced by one-third after three weeks by placing the subjects on healthy carbohydrate-, plant-based diets. This study also showed a significant reduction in blood pressure (6/8 mm Hg), triglycerides (26%), cholesterol (22%) and weight (body mass index — 4%).
Overall poor health and early death – Research which tracked thousands of middle-age adults for 20 years found that those on a high protein diet are 74 % more likely to die of any cause within the study period than their low-protein counterparts.
Can vegans and those on a plant-based diet get enough protein?
Vegetables, grains, legumes, and nuts and seeds contain all the essential amino acids, and humans are virtually certain of getting enough protein from plant sources if they consume sufficient calories.
The average protein level in legumes is 27% of calories, nuts 13% of calories seeds 19%, grains 12%, and vegetables 22%.
Plant foods can supply the recommended amount of protein as long as the energy requirements are met.
Protein Combining – Do vegetarians have to combine foods to get complete proteins?
Protein combining (combining certain foods – like beans and rice or bread and peanut butter – to form a complete protein) was a theory from long ago that has been discredited over and over, but has had a hard time saying good-bye.
The “incomplete protein” myth was inadvertently promoted in the 1971 book, Diet for a Small Planet, by Frances Moore Lappe. In this book, the author stated that plant foods do not contain all the essential amino acids; so in order to be healthy, a vegetarian needed to eat a combination of certain plant foods in order to get all of the essential amino acids. It was called the theory of “protein complementing.”
I am quite sure that Frances Moore Lappe did not intend to promote a false theory, and in fact she later retracted her statement and apologized for promoting a myth.
The idea of protein combining became more superstition than science and has been totally refuted.
All plant based foods, with the exception of most fruit, have varying amounts of protein. Vegetables and grains contain all essential amino acids and non-essential amino acids in varying proportions, and will supply in excess of what is necessary for your daily needs.
Plant proteins are complete.
In addition, the human body stores amino acids for many days, and they can be utilized as needed.
Healthy Sources of Protein
Protein from plant sources, like beans, nuts, grains, and vegetables are the best sources of protein because they come packaged with fiber – which helps fight obesity, diabetes, heart disease, and other diseases. Also, plant protein is missing the inflammatory response found in animal proteins. What’s more, plant protein has less aging enzyme activation.
I’m an athlete/I work out. Should i increase my protein intake?
People looking to bulk up sometimes load up on protein, thinking steak and protein powder will produce insta-muscles.
Protein doesn’t build muscles. Exercise does. (The hormones in meat help a little too, but do you really want to build muscle with zeranol, trenbolone acetate, and progestin melengestrol acetate and increase your risk of disease in the process?).
Carbohydrates are actually the best fuel used to build muscle.