Doing Everything Right But Still Feeling Sluggish? ‘SHE MD’ Says Your Metabolism Might Be Burned Out

You’re in your fit-girl era—HIIT classes five times a week, fasting till noon, logging every calorie. You’re “doing everything right,” on paper, so why are you gaining weight, feeling puffy, and dragging through the day like your body’s working against you?

That’s the exact question tackled on SHE MD, where host Mary Alice Haney sits down with functional nutritionist Micaela Riley to explain what’s really happening when your metabolism feels fried. Whether you’ve been dieting since high school or just can’t figure out why your workouts backfire, this one’s for you.

Doing Everything Right But Still Feeling Sluggish? It Might Be Metabolism Burnout

What metabolic dysfunction actually means

Metabolic dysfunction sounds clinical and scary, but it’s essentially your body’s inability to properly process the food you eat, specifically how it handles blood sugar and insulin. “Eighty-eight percent of Americans are metabolically unhealthy,” Riley notes, which means this isn’t some rare condition—it’s an epidemic.

That said, there are actually two types of metabolic dysfunction Riley sees in her practice. The first is classic insulin resistance, where insulin levels spike but glucose can’t get into your cells properly. This leads to weight gain concentrated around your midsection, that 3 p.m. crash after lunch, and relentless sugar cravings no amount of willpower can fix. “That would be the metabolic dysfunction of it all,” she points out. 

But the second type? “I see a lot of women who have chronically dieted, under-eaten their whole life, and they actually almost get pancreatic burnout,” Riley explains, “so insulin is really low but you also see really high A1C blood sugars.” That means your pancreas is so exhausted from years of restriction that it’s barely producing insulin anymore, but your blood sugar is still elevated.

Research on adaptive thermogenesis backs this up. Basically, when you’re constantly calorie-cutting, your body hits survival mode and dials down how much energy it burns. Studies show that after sustained dieting, your metabolism can run 10 to 15 percent slower than expected for your size—and for some people, that slowdown sticks around as hundreds of calories a day less burned than what the math says it “should” be. In plain English? Your body literally learns to function on less fuel, which is why you can be consuming a mere 1,200 calories a day and still not see the scale budge.

The red flag symptoms you’ve been ignoring

Your body’s been sending SOS signals, but between work stress and doomscrolling, you’ve probably written them off as “just getting older” or “needing more discipline.” Riley says these are the red flags she sees over and over again with her clients:

• Pounds that refuse to drop, even in a calorie deficit
• Post-meal crashes instead of feeling fueled
• Constant sugar cravings
• That puffy, inflamed feeling that never fully goes away
• Cold hands and feet no matter the season
• Hair loss seemingly out of nowhere
• Irregular, painful, or missing periods
• Chronic constipation
• Brittle nails and dry, lifeless hair

Sound familiar? This isn’t about discipline. It’s your body hitting you with receipts that your metabolism’s not vibing. The frustrating part is that standard lab work usually won’t catch it. “A lot of PCPs will just be like, ‘Oh, everything looks fine,’” Riley says, “But it’s like 0.1 away from being really not good and we see that all the time.” You can be technically “in range” on paper while still sliding toward dysfunction and feeling miserable.

Why cortisol is the villain in your weight gain story

If there’s one hormone pulling the strings behind metabolic dysfunction, PCOS, thyroid issues, and stubborn weight gain, it’s cortisol—your stress hormone.

“Cortisol has a very intricate relationship with every single hormone in your body and it can actually stimulate androgens which trigger a lot of PCOS-like symptoms,” Haney says. “It really is at the root of so many issues, especially PCOS, because it just triggers insulin resistance, blood sugar issues, androgens, it is at the core of so many hormone-related issues and it leads into leaky gut, SIBO, more gut dysfunction which is going to create hormone issues down the road.”

And it’s not just mental stress. Physical stress counts too—and for a lot of women, workouts are a major cortisol trigger. If you’re already maxed from work, relationships, under-eating, or zero sleep, stacking HIIT on top is like doubling down on the stress. Your body clocks it as another threat, cranks cortisol even higher, and slams the brakes on weight loss as self-protection.

How to get your metabolism back on track

So, if your metabolism feels fried, where do you even start? Riley’s reset flips the usual “eat less, train harder” script on its head.

Eat more, not less

Start with 30 grams of protein within an hour of waking. Riley’s go-to is a scrambled egg bake with veggies and turkey bacon that lands at exactly 30g. Use “reverse dieting”—gradually increasing your calories to rebuild your metabolic rate. Yes, this might feel terrifying if you’ve spent years restricting, but your body needs adequate fuel to heal. “Slowly trying to increase those calories to increase the metabolic rate is really effective,” Riley notes.

Stop punishing yourself with exercise

Ditch the daily HIIT classes. Riley recommends “more lower-intensity strength training, Pilates, walking, yoga.” Some clients even take complete breaks from exercise for a few weeks “to kind of let their body depuff and get the inflammation out of the system.” This doesn’t mean becoming sedentary, but choosing strategic, restorative movement instead of constant high-intensity punishment.

Prioritize sleep like your life depends on it

Eight hours minimum, non-negotiable. Sleep deprivation wrecks insulin sensitivity, spikes cortisol, and makes weight loss nearly impossible.

Address lifestyle stressors beyond food and exercise

Riley shares that some of her health issues resolved when she left a toxic relationship. Take a look at your work boundaries, draining relationships, your default answer to requests, and the overall pace of your life. “I was go-go-go. I was going to school full-time, I was working, I was teaching group fitness classes, like just doing as many things as I possibly could,” Riley recalls. “Just kind of slowing down, start saying no more often.”

Get proper testing, don’t guess

Push for comprehensive panels: full metabolic (insulin, A1C, fasting glucose, cholesterol, triglycerides), complete thyroid (not just TSH), and ideally a Dutch test for hormones. “The Dutch test is something that really helped me on my journey,” Riley says. If your doctor dismisses your concerns because you’re “in normal range,” consider working with a functional medicine practitioner who looks at optimal ranges and the full picture.

Be patient with the timeline

Remember Riley’s 3x rule—it takes roughly three times as long to fix your metabolism as it took to break it. You’ll see improvements within three to four months, but full metabolic recovery is a long game. One of Riley’s clients has been working with her for a year and a half, slowly rebuilding after years of restriction.

It’s important to remember that everyone’s body is different, so be sure to talk with your doctor or a qualified health professional before making big changes to your routine. 

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