Americans, in general,
are obsessed about protein. Someone we
know or love or both, like a friend or kid, goes vegetarian, and we freak out—but
how will they get enough protein???
Here’s the deal: unless you or someone you know happens to be
food insecure (i.e., unlikely to get enough food to prevent malnutrition/starving),
the odds are very very slim that daily protein needs are not going to be met.
Don’t believe me? Here is some math to compute Recommended
Daily Allowance. Keep in mind that the RDA
is intended to meet the needs of most people, meaning that many of us don’t
need even the full RDA. The RDA for
adults ages 19 to 50 is .8 g of protein per kg of body weight. The average American, according to the
internet, weighs 80.7 kg (177.54 pounds).
That Average Jane/Joe would need 64.56 g of protein per day. If she/they/he is in fact average for an American,
actual protein intake is about 100 g per day, or well over the requirement.
What if Jane/Joe is a
child? She/they/he does need slightly
more grams of protein per kg of body weight (1.52 g/kg for infants to 6 months
old, 1.5 g/kg for babies up to 12 months, 1.1 g/kg for toddlers 1-3 years old,
.95 for children 4 to 13, and .85 for teens 14 to 18). Still, this goal is totally manageable and almost
always surpassed by Americans who have sufficient food at all.
If Jane/Joe is an
athlete, she/they/he probably still doesn’t need to increase protein
intake. Muscle activity is first fueled
by glucose and fatty acids. Protein is essential
for rebuilding the exercise-damaged tissues in their new, stronger iterations
after weight work, but again, the overages built into what we already eat take
care of any additional needs. Specifically
supplementing for protein often just results in too many calories, which turn
into fat, which in turn impedes performance.
The deal is the same if
Jane/Joe is pregnant or lactating. Usual
intake covers additional needs.
If Jane/Joe is a
vegetarian, the impact on her/their/his protein intake depends on what kind of
vegetarian. Lacto-ovo vegetarians can
relax, as can the tofu-lovers: animal
sources of protein and soy are complete proteins. Vegans have to do a tiny bit more thinking
because it’s not enough just to have protein; we need to ensure that we get all
the essential amino acids our bodies can’t make. Plant sources of protein, except for soy, don’t
have them all in a single source, so vegans have to choose complementary
protein sources (i.e., two or more protein sources that between them contain
all the essential amino acids). The good
news is that this isn’t hard. Remember
our friends rice and beans? They have an
important message for us: combine a
grain with a legume and get complete protein.
That means peanut butter on bread works.
Lentil soup with crackers, beans and tortillas, pasta with beans, rice
and black-eyed peas, and garbanzos with sesame paste (hey, I call that hummus,
myself!) all work.
There is some evidence
that older adults (those of us who have passed that half-century mark) can
benefit from a slightly higher protein intake (about 1.5 g/kg of body weight) to
improve muscle mass, strength, and function, boost immunity, wound healing, and
bone health. The theory is that we are
less efficient at digesting and absorbing protein as we age, so we need more to
work with. Again, Jane/Joe probably
doesn’t have to worry or even strive to meet that goal.
So yes, we need protein,
but no, we don’t need to worry about getting enough unless we are vegans or
people with general food insecurity.