For a long time, I was doing everything right — by my own definition of right. I ate clean, kept things light, and was tired all the time: not dramatically, just a persistent flatness that sat underneath everything.
For a long time, I was doing everything right — by my own definition of right.
I ate clean. I avoided processed food. I kept things light. And I was tired all the time. Not dramatically, not in a way anyone noticed. Just a quiet, persistent flatness that sat underneath everything. A foggy slowness in the mornings. A kind of cognitive drag after meals that I kept blaming on other things — poor sleep, stress, overwork, the general weight of being a functioning adult.
It took me years to understand that what I was calling discipline was quietly draining me. And the thing I was missing wasn't more willpower, better sleep hygiene, or a new supplement. It was protein. The most unsexy answer, and the most accurate one.
What I actually ate in my early 20s
Oats. A lot of oats. Granola, fruit, maybe some yogurt if I was feeling generous with myself.
A single meal built around volume and lightness, chosen not because I was paying attention to nutrition but because I was paying attention to the wrong thing entirely — weight. The logic was simple and wrong: eat less, weigh less, feel better. My main reference point for food was what it might do to my body visually, not what it was or wasn't giving my brain.
At some point, I was diagnosed with severe anemia. I had barely been eating meat, and when I did eat, protein wasn't something I was tracking or prioritizing. My body eventually told me what I had been ignoring.
I switched to eggs every morning after that. For a while, it helped. Then I gained a little weight, panicked, and cut back to one egg instead of two or three — not because a doctor suggested it, not because I had any nutritional reason, but because I was still operating from the same flawed equation. Smaller portion equals safer. What I didn't understand then is that the number of eggs was never the actual variable.
Why protein is fuel, not just food
Protein isn't a macronutrient your body stores and draws from slowly, the way it does with fat. It needs a relatively steady supply to do its job. And its job is enormous.
Research published in the Journal of the American Dietetic Association found that amino acids from dietary protein are the direct precursors to neurotransmitters, including serotonin, dopamine, and norepinephrine. Your body cannot manufacture these from nothing. Tryptophan becomes serotonin. Tyrosine becomes dopamine.
Without enough protein moving through your system, neurotransmitter production slows, and you feel it — as low mood, difficulty concentrating, a strange flatness that doesn't respond to rest.
This is not a subtle biochemical footnote. It is the mechanism. When people describe feeling foggy, unmotivated, or emotionally flat despite eating what looks like a healthy diet, this pathway is often where the answer lives.
A study examining protein-deficient diets found that reduced amino acid availability led directly to lower concentrations of key neurotransmitters involved in learning, memory, and emotional regulation — and that restoring those amino acids reversed the behavioral changes. The brain is not separate from what you eat. It is downstream of it.
The fog I couldn't explain
One of the clearest signs I wasn't getting enough protein was something I didn't have language for at the time: I couldn't think properly after my first meal. I'd eat around 1 pm — something I'd convinced myself was a reasonable hour — and instead of feeling clearer, I'd feel heavy, slow, unable to focus. I blamed it on the meal itself. On needing more coffee. On being tired.
What was actually happening was that my body had been running on insufficient fuel for hours, and when food finally arrived, it didn't have enough to work with. The cognitive drag wasn't caused by eating. It was the result of everything that came before eating.
Research on undereating and cognitive function suggests that insufficient intake increases the risk of nutritional deficiencies that directly contribute to the kind of mental sluggishness I was experiencing — difficulty with concentration, memory, and mental clarity. The brain consumes roughly 20% of the body's energy. When protein is chronically low, it doesn't just affect your muscles. It affects your ability to think.
The protein powder I was afraid to take
When I finally started reading properly about nutrition — not diet culture, but actual physiology — protein powder kept coming up. And I kept dismissing it.
My mind had built a very specific story around it: that was for people trying to bulk up, that it would lead to weight gain, that it wasn't for someone eating the way I ate. I had read studies that said otherwise. I knew, intellectually, that the fear wasn't rational. And I still stalled for months.
Eventually, I added it. Not because I'd fully convinced myself, but because I was tired of being tired.
The change I noticed was quieter than I expected — not dramatic, not sudden — but real.
The afternoon fog thinned. My mornings felt less slow. The thing I had been afraid of turned out to be one of the simplest forms of care I could have offered myself earlier.
I mention this not to recommend protein powder specifically, but because the psychology underneath that resistance is worth naming. When the relationship with food has been shaped by fear and control for a long time, even neutral information gets filtered through that lens. Something that is simply nutritious can still feel threatening.
It was never about the number of eggs
When I cut from two or three eggs down to one, I thought I was making a calibrated choice. What I was actually doing was removing one of the few reliable protein sources I had, in response to a number on a scale, without understanding what I was taking away.
The problem was never the eggs. The problem was that I didn't yet understand what protein was doing — that it wasn't a variable to minimize but a resource my brain and nervous system depended on. Once I understood the mechanism, the behavior stopped making sense. You wouldn't cut your sleep down to four hours because you were trying to be lighter. But when the connection between food and cognitive function isn't clear, that's essentially the logic that operates.
Understanding why the body needs something is different from being told to eat more of it. One is knowledge. The other is instruction. Knowledge tends to stick.
What chronic low protein can quietly do
The symptoms don't announce themselves. That's part of what makes this easy to miss for years. Research on protein deficiency and mental health points to a pattern of symptoms that are easy to attribute to stress, burnout, or personality: mood instability, increased anxiety, difficulty sleeping, persistent fatigue, poor concentration. Each one individually sounds like modern life. Together, and in the context of a chronically low-protein diet, they point somewhere more specific.
The nervous system doesn't go into loud alarm when it's undernourished. It just gets quieter. Duller. Less responsive. You stop feeling sharp. You stop feeling much at all, in the mild and ordinary way that starts to feel like your baseline.
That quiet is what I spent most of my early 20s inside, without realizing it wasn't just who I was.
What actually changed
Not a single dramatic moment. No revelation. Just a slow accumulation of information that eventually made the old logic impossible to maintain.
Eating enough protein didn't fix everything. But it gave my nervous system something to work with. The fog lifted in increments. The afternoon crashes became less predictable, then less frequent. The flatness that I had assumed was my personality started to feel more like a symptom I had been living around for a very long time.
The body is not separate from how you think, feel, or move through the day. It is the medium through which all of that happens. What you feed it is not a moral question. It is, in the most literal sense, a question of what you have to work with.
