The weight is coming off. The question nobody warned me about is what comes off with it.

I'm full after about three bites now. Some days I look up and it's the evening and I've had a coffee and a few spoons of yogurt, and that's it.

That's the part nobody says out loud: when the food goes, everything in it goes too. Protein, iron, calcium, B12, magnesium. A 2025 review in Frontiers in Nutrition found people on these meds were coming up short on fiber, calcium, iron, magnesium, potassium and a string of vitamins.⁴ You can be losing weight and running on empty at the exact same time.

Run down. No gas in the tank by the afternoon. The kind of wiped-out that sleep doesn't fix.

I wanted it to be something dramatic. It wasn't. When you're barely eating, your body's running on fumes, and the dietitians who work with GLP-1 patients say low energy is one of the first things they look at. It tracks with how little you're getting in.

Clumps. My brush full after one go. It scared me more than I let on.

It's a known thing with fast weight loss and low protein and nutrient intake, and the FDA's adverse-event system has logged more than a thousand hair-loss reports tied to these meds.⁵ I'm not going to tell you a scoop of anything regrows hair, because it doesn't. What I'll tell you is that the day I learned the link ran through nutrition, "am I even feeding myself" stopped being a vague worry and turned into a real question.

Deflated is the word I kept coming back to. Thinner everywhere, but the tone was just gone.

My doctor said it flat out: muscle is the first thing to go with fast weight loss. A joint advisory from four big medical and obesity groups put numbers on it, in one major trial about 38% of the weight people lost was lean mass, not fat.¹ Their advice wasn't to stop. It was that what you eat matters more while you're eating less, not less. Muscle is the thing holding you up.

For the first time in my life the chatter stopped. No negotiating with myself all day. I'd have given anything for that.

The catch is the hunger cues went with it. If I don't set a timer, the day just goes by and I haven't eaten. A registered dietitian at UCHealth said the thing that finally made it click for me: when you're eating about half what you used to, every bite has to count.

So I bought one, like the Harvard piece suggested. Fine first step.

But it's a handful of isolated vitamins in a pill. On the days I'm barely eating, I wanted something closer to actual food, something that covered more than a few lines on a label. That's a different thing, and it's where I landed next.

I didn't want another routine. On a morning I'm forcing myself to eat, the last thing I need is five more bottles on the counter.

AG1 is one scoop in water, a whole-food-based daily foundation of 75 ingredients, including clinically studied probiotics for your gut, and it's clinically shown to close common nutrient gaps. I drink it with my protein, not instead of it. It's the one thing I can actually get down on a low-appetite morning when solid food isn't happening.

I'll say it twice because it matters. AG1 is food-based daily nutrition. It's not a drug, it doesn't replace your medication or your protein or your doctor's plan, and you should clear anything new with whoever prescribed yours.

What it does is plain and worth doing: on the days I eat like a bird, it's how I make sure I'm at least getting something real in. For me that was the missing piece. Your doctor will know what's right for you.