So, I wanted to sit down and go myth by myth through the stuff I hear most often from clients and on my feed, and tell you what’s actually true, what’s outdated, and what’s going to genuinely move the needle for how you feel and how well you age. Let’s get into it.

Myth #1: “Cardio burns fat. Lifting just bulks you up.”

Nope — cardio and lifting aren’t rivals; they’re a package deal.

Cardio is fantastic for your heart and your mitochondria, but muscle is the tissue that burns through your blood sugar and keeps your metabolism humming all day long. If you skip lifting, you’re skipping your best longevity tool, full stop.

So, stop being a cardio bunny exclusively and go pick up something heavy — your future self will thank you. Of course, start low and go slow to prevent injury.

Myth #2: “You’re too old to build real muscle.”

I get this one constantly, and it’s just not true.

We have data on people in their 70s and 80s building real, measurable muscle — your muscles don’t check your birth certificate, they just respond to whether you show up.

A good sample week looks like 2-3 full-body strength days hitting upper, lower, push and pull, plus 2 days of zone-2 cardio (that’s 45+ minutes at an easy, conversational pace), with rest or light movement filling in the rest of the week.

Consistency beats age every single time.

Myth #3: “Eating one or two eggs a day means you’re covered.”

I’ve looked at thousands of food journals over the years, and I rarely — I mean rarely — see someone hitting their protein macros.

Here’s why it matters more as we age: your muscle gets “hard of hearing” to protein, meaning the same amount sends a weaker muscle-building signal than it did when you were 25. We call that anabolic resistance, and basically your muscles need you to “yell louder” with more protein to get the same message through.

Aim for roughly 1.2-2.2g of protein per kilogram of bodyweight, which lands around 100-150g a day for most people, and pay special attention to breakfast — it’s the meal almost everyone under-doses on protein, and it’s the one that matters most for triggering muscle building.

Myth #4: “Detox is just a catchy Instagram phrase.”

Detoxification is real, and your body needs clean living to actually function. Your liver has over 500 jobs, and one of the biggest is clearing hormones, food byproducts, and additives, moving them through your natural pathways and out — every single day.

Think of it this way: you don’t want the garbage person to pick up your trash and dump it right back into your kitchen! And this is the liver’s job, to make sure the trash ends up leaving the body via the toilet and sweating. 

So, if you’re looking for a real, well-researched lever here, sauna is it — it’s a legitimate cardio-adjacent tool that supports circulation, triggers heat-shock proteins and builds cardiovascular resilience while supporting the liver’s detoxification pathways. It is basically cardio without moving.

Myth #5: “Fiber’s optional if you’re already ‘eating healthy.'”

Fiber is not optional. In one study, higher fiber intake dropped visceral fat by 24.6% in just 16 weeks — and visceral fat is the deep belly fat wrapped around your organs, not the stuff you can pinch under the skin.

Visceral fat is the type of body fat most strongly linked to heart disease, diabetes, and other metabolic problems, which is exactly why it matters so much more than the number on the scale. Most Americans get under 10g of fiber a day, so even adding 10g moves the needle.

Aim for 30-35g daily from real food — berries, beans, veggies, whole grains.

Myth #6: “80% of your immune system lives in your gut.”

Your gut lining is held together by tight junctions — tiny doors between cells. Wreck that lining, and those doors widen, letting undigested food, toxins, and bacteria slip into your bloodstream. No bueno!

This is all part of something called GALT, gut-associated lymphoid tissue — think of it as immune boot camp, where your gut samples everything you eat and drink and teaches your immune cells what’s safe versus what’s a real threat.

So, if you take care of your gut, you are supporting your immune system as well.

Myth #7: “All inflammation is bad, full stop.”

Inflammation is a smoke detector — it’s good when it goes off for a real fire, and bad when it won’t stop ringing for years. When you fall and break your wrist, you want inflammation to help with healing.

However, remember that leaky gut we just talked about? That’s one of the biggest triggers of chronic, low-grade inflammation. Processed food, poor sleep, and visceral fat quietly simmering in the background for years are some of the root causes.

Myth #8: “Hormone support is just too risky to consider.”

Low-dose hormone support can genuinely protect bone, brain, and heart for women in peri- and post-menopause.

And for men, low testosterone shows up as lost muscle, fatigue, and stubborn belly fat — and it’s testable.

Here’s some context: back in 1925, women were living only until their late 50s, and now we’re living some 30 years longer. We all deserve to have the conversation around hormone replacement therapy in mid life to see if it can support longevity goals and quality of life.

Myth #9: “My metabolism just randomly slowed down.”

Your metabolism didn’t betray you — you likely lost some of the furnace that was running it, and that furnace is muscle.

Less muscle means fewer calories burned just existing. Muscle loss happens gradually starting in your 20s and accelerates after 40, and as that furnace shrinks, so does your metabolic rate.

More muscle means more calories burned at rest and better blood sugar control — it really is that straightforward.

Myth #10: “My labs are normal, so I’m totally fine.”

“Normal” often means only one narrow marker got checked, and that’s a problem. Thyroid is the classic example — TSH isn’t even a thyroid hormone, it’s just one marker in a panel of seven, so relying on it alone does not provide your full thyroid picture.

Vitamin D is another one — the reference range is 30-90, and people get told they’re “normal” at 30. Being on the low or high end of a lab range is rarely optimal.

Myth #11: “Intermittent fasting is a scam.”

This tool has genuinely helped many people with weight and blood sugar, and beyond that, it has research behind it for cancer prevention and broader metabolic health through processes like autophagy and improved insulin sensitivity.

But context matters!! If you are under high stress, extended fasting can backfire and start eating into muscle instead of fat. And here’s a mindset shift worth sitting with –we do not all need to eat three meals a day. That’s a cultural habit, not a biological requirement.

Myth #12: “Supplements can fix a bad diet.”

No pill replaces real food, but a handful of supplements have solid, repeated research behind them as genuine support: D3/K2, magnesium, omega-3s, creatine, and a quality multivitamin.

Roughly 42% of U.S. adults run low in vitamin D, and an estimated 48-50% of Americans don’t hit the RDA for magnesium from food alone — which matters for sleep and insulin sensitivity.

Most Americans also run a low omega-3 index because the standard American diet skews heavily toward inflammatory omega-6s instead.

And creatine isn’t just for gym bros — it’s one of the most-studied supplements in existence, with solid data on muscle, brain function, and mood at 3-5g a day.

A quality multivitamin covers the everyday nutrient gaps a real-world diet leaves behind — the COSMOS trial even linked daily multivitamin use in older adults to measurably slower cognitive decline.

Of course, none of these are a substitute for actually eating food that isn’t in a wrapper.