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My twin sister and I both lost 25 pounds on GLP-1 in three months. Then I stopped. She didn’t. It took me four months to find out why. My twin sister Deb and I did our first injections on the same Sunday night, on the phone with each other, counting down like it was New Year’s. Same medication. Same starting dose. Shots on Sundays, weigh ins on Fridays, a text thread called Half of Us. We’re 57. Identical. Same face, same build, same knees, same weakness for anything with a crust on it. If two human beings were ever going to get the same result from the same drug, it was us. And for three months, we did. Down 8 the first month. Down 17 by the end of the second. 25 pounds gone by week twelve, both of us, within a pound of each other every single Friday. We joked we should sell tickets. Then week thirteen, my scale stopped. Hers didn’t. Seven months in, Deb is down 58 pounds and wearing a dress she hasn’t fit into since 1991. I’m still down 25. Actually 22 now, because it’s started creeping back. Same drug. Same DNA. For the first three months, even the same dose. And when I finally found out why, it had NOTHING to do with tolerance, my set point, my age, or how carefully I was logging. Let me back up, because I know some of you are sitting exactly where I was. The first three months, the shots did everything they promised. The food noise went quiet. That constant hum about what’s in the pantry, what’s for dinner, whether there’s pie. Gone. For the first time in 40 years of dieting I felt like a normal person around food. And the scale rewarded me for it every Friday. Then in month four we moved our mother into memory care. Deb helped. But I’m the one who lives twenty minutes away, so I was the one doing the tours, the paperwork, the phone calls, the sitting in the parking lot afterward. And somewhere in that month, the noise came back. Mid week. Days after my shot. Standing at the kitchen counter at 9pm eating the crust off a pie I’d bought for the nurses. On a medication that was supposed to make that impossible. I thought my dose had quit on me. Everybody says that happens. That’s what my doctor said too. “Completely normal. Almost everyone plateaus around month three. Your body’s adjusted. We’ll go up.” So we went up. Two weeks of nausea so bad I was eating maybe 900 calories a day and could not look at chicken. Deb’s Fridays kept dropping. Mine went nothing, nothing, up one, nothing. And that became the pattern. Calm week, quiet head, maybe half a pound. Hard week with Mom, the noise ran straight over the medication and the scale froze solid. Like stress had a manual override on a $400 a month drug. And now a higher dose of it. At my next appointment I said it straight out. My twin is on this. Identical twin. She’s 30 pounds ahead of me. What is different? “What dose is she on?” my doctor asked. I told her. Deb was still on the dose I’d left six weeks earlier. I was taking MORE medication than my identical twin, eating less than she was, and she was still losing while I was gaining. So my doctor ran labs. Thyroid, full panel, the works. Everything came back fine. And then she said the sentence I’ve been chewing on ever since. “Carol, twenty five pounds is a wonderful result. Some people just find their floor. This may be your body’s happy weight.” Happy weight. I have 30 more pounds to lose. My knees know it. My blood pressure pills know it. My twin sister’s face, which is MY face, is 30 pounds lighter than mine across the table every Sunday. But sure. Happy. So I posted my numbers in my group. And I got forty different answers, I’m sure you can imagine. “Plateaus are normal, push through.” I’d been pushing through for four months. “Calorie creep. You’ve gotten sloppy with your logging.” I hadn’t. Food scale, notebook, every bite. Same as month one. “You’re eating too little now, your body’s holding on.” So I’m eating too little, but my doctor says go up a dose and eat less? “It’s water.” For four months? “Take a drug holiday and reset.” I was not paying $400 a month to take a week off. “Switch to Zepbound.” I asked. My doctor wanted to give this one more time. And then the one I still think about. “Honestly nobody stalls for four months on these if they’re actually compliant. Something isn’t adding up.” I read that standing in my closet. I was in there because I’d just tried on the jeans I bought in month three, my reward jeans, and they didn’t button anymore. I sat down on the floor of that closet and cried. Here’s the thing nobody tells you about stalling AFTER you’ve lost some. Nobody feels sorry for you. Everyone thinks you should be grateful. “You look great! Aren’t you glad you did it?” My husband. My daughter. The ladies at church. And I’d smile and think, I’m not done. I’m nowhere near done. And the thing that was working just stopped, and not one person can tell me why. And here’s the part nobody could explain. My sleep got worse the higher my dose went. Not better. Worse. Shot night especially. I’d lie there wired, heart doing something I could feel, wide awake at 3am over nothing. My watch kept flagging it. Elevated heart rate, sleep score in the gutter. My body was screaming that something was wrong while every blood test said I was fine. Meanwhile my group was a highlight reel. Down 40. Down 65. Goal weight. Women who started AFTER me passing me on the way down. And every single one of them had “plateaued and pushed through,” so what on earth was wrong with ME? One night at 1am I googled “semaglutide plateau permanent.” Turns out there’s a whole vocabulary for it. Set point. Metabolic adaptation. Long articles about how your body “defends” a weight. I read all of it with my heart pounding and thought, that’s me. My body decided. Twenty five pounds and the door shut. I drafted the message to my doctor asking to drop to a maintenance dose. What was the point of paying $400 a month to hold steady. It sat in my phone. Unsent. Then I asked my sister the question that changed everything. Thanksgiving. The two of us drying dishes at my sink. Deb in a dress I’d have needed to be unzipped to get into. “I need the truth. What are you doing that I’m not?” She put down the towel. “You’re going to be mad.” “Why would I be mad?” “Because it’s something my doctor made me start before my first shot. It costs about $30. And I assumed yours had you on it too, because mine acted like it was standard.” She warned me this can become more of an issue the longer you’re on the shots and the less you’re eating. Before Deb’s first injection, her functional medicine doctor told her something Deb wrote down in her phone. She dried her hands and slid it across the counter. “Every woman I put on these medications starts magnesium first. Because the shot is about to create the exact deficiency that stops it from working. And it doesn’t stop it on day one. It stops it the week the reserves run out.” I read it twice. Then I looked up at her. Magnesium? I TAKE magnesium. Every night. Since week two on the shots, for, let’s say, the reason every woman on these shots ends up taking it. The bottle from the drugstore is on my nightstand right now. “What kind?” The drugstore kind. I had no idea. “That’s the problem. Wrong form. Now let her explain it the way she explained it to me. Because it explains my whole first three months and your whole last four.” So here it is, the way Deb gave it to me. Your stress response works like a thermostat. Turns up under pressure, turns back down after. Magnesium is the fuel that lets it turn back down. When you’re depleted, the thermostat sticks on high, and your body reads that as an emergency. An emergency means storage mode. Hold onto everything. Release nothing. The shot quiets your appetite. It does nothing about storage mode. So you can take your foot off the gas all you want. Stress is still standing on the brake. “Now here’s the part about the plateau,” Deb said. “The part nobody told you.” Almost all of your magnesium comes from food. Most women over 50 are already running low. Stress burns it, medications drain it, even the soil our food grows in has less than it used to. Then you start a GLP-1, and suddenly you’re eating half of what you ate before. The drug is doing its job perfectly. But half the food means half the magnesium. “You weren’t empty on day one,” Deb said. “You’d been eating normally your whole life. Then for three months you ate half as much. Every week there was less coming in.” “And right when you’d been doing that for months, Mom happened.” Stress went through the roof. My sleep fell apart. I was eating less than ever. “That’s the part my doctor watches for,” she said. “Not some magic week on the calendar. The longer you’re eating that little, the easier it is for a gap to catch up with you.” Then my doctor went up a dose. Less food. Worse nausea. I was eating even less than before. And suddenly what had happened made a lot more sense. Then she said something that shut me up. “Carol, if 25 pounds was really your body’s happy weight, why was MY identical body perfectly happy losing another 30?” That was the first time “happy weight” stopped sounding scientific to me. I pushed back. Obviously. “My labs were normal. She checked everything.” “She checked everything that comes back normal. A standard test measures the magnesium in your blood. Almost all of it lives inside your cells, and no routine panel looks there. You can be starving at the cellular level and pass every test. Nobody checked mine either. Nobody checks anyone’s.” Everything they tested was fine. The thing that wouldn’t have been fine, nobody tested. They had a word for it instead. Plateau. And a word is where the investigating stops. I said what you’re probably thinking right now. “This sounds like the cortisol girls on Instagram. The moon face videos. If a supplement fixed stress we’d all be taking it.” “I said the exact same thing to her,” Deb said. “And she said, I’m not selling you a cortisol detox. Your medication changed how much you eat. When you eat that little, you replace what’s missing or your body fights the drug. That’s not a trend. That’s arithmetic.” “But I’ve been taking magnesium this whole time,” I said. “Wrong form. The type in the bottle you have never made it to where it matters.” She took a light blue bag out of her purse. SPNutrition. Magnesium bisglycinate gummies. “This is the kind my doctor specifically told me to take. Bisglycinate. Not just whatever bottle says magnesium on the front. Absorption is up to 90%.” And she said the gummy is the other half. Because you chew it, it breaks down like food unlike a pill, so your body treats it like food. These shots slow your stomach way down, so that matters more than it sounds. And on the higher dose, my stomach was barely moving at all. Two gummies before bed. That was the whole protocol. That was the thing I’d be mad about. Seven months. $2,800 in injections. And apparently the difference between me and the woman who shares my DNA was a $30 bag her doctor told her about before she ever took her first shot. I still half didn’t believe her, so here’s what I did next. I went home and researched for three hours. The studies on magnesium and the stress response. The nutrient gaps that show up when people eat this little. The clinical trial data on the group that loses early and then stalls. It all checked out. I’d scrolled past this stuff for months assuming it was scammy. Some of it is. The arithmetic isn’t. I ordered that night. 60 day money back guarantee. After four months of paying $400 to hold steady, $35 was not the risk in my life. Day one, nothing. I want to be honest about that. End of week one, I was falling asleep faster. The forty minutes of ceiling staring shrank to ten. Week two is when it happened. I slept through the night. Straight through, no 3am, first time since we moved Mom. Even shot night. My watch noticed before I did. And that Friday, the scale moved. Two pounds. In one week. After seventeen weeks of nothing. And here’s the part I need to be precise about, because it matters. Nothing about my medication changed. Same drug. Same dose. The exact dose that had given me nausea and nothing for two months. The medication didn’t suddenly start working again. It never stopped working. My body finally had the fuel to stop fighting it. Weeks three and four, steady. A pound, sometimes two, most weeks. The way it had been in month one. A hard week hit with Mom’s facility and, for the first time, the food noise stayed quiet through it. That’s when I actually believed it. Week six, the reward jeans buttoned again. I’m past them now. Down 36 as I write this. Still behind Deb. She had the answer before her first shot and never stalled a single week. I don’t care anymore. My Fridays move again. For four months I thought I’d hit my floor. My happy weight. The number my body decided on. I hadn’t hit anything. I’d run out of fuel. And every dose increase and every “push through” dug the hole deeper, because eating half the food means getting half the magnesium, and I’d been on the shots just long enough to empty the tank. And not one person in a white coat thought to look for it. I still take my injection every Sunday night. Same drug, same dose, nothing changed. I still have stress. I still have Mom’s care and the phone calls and the ladies at church. I just stopped running on empty. Every night before bed, I take two gummies. Thirty seconds to chew. My magnesium replenishes, my body comes off high alert, and the medication I was already paying for finally gets to finish the job it started. Honestly, that should be standard care for every woman starting these injections. And somebody should tell you, before your first shot, to pay attention to what happens the longer you’re eating this little. If you lost beautifully for the first two or three months and then it just... stopped. If your doctor’s whole answer was “go up” and all you got was worse nausea. If everyone’s congratulating you on a number you are nowhere near done with. If you’re logging exactly the way you did in month one and people are telling you you’ve gotten sloppy. If you already take magnesium, the drugstore kind, every single night, and your scale hasn’t moved. If your sleep got worse the higher your dose went, and you’re lying there at 3am wondering if 25 pounds is all your body is ever going to give you... I’m not saying you definitely have a magnesium deficiency. But I spent four months and $1,600 asking a higher dose to do a job my body didn’t have the fuel to finish. SPNutrition is a small company. They make their gummies in limited batches using pure magnesium bisglycinate, the specific form Deb's doctor had put her on from the beginning. Right now they’re running a sale. I checked the site this morning and ordered a second bag for a woman from my group who messaged me privately after I posted my update. She stalled at month three too. She starts hers this week. To be honest, I panicked a little when I saw the sale banner, because every time they run one of these, they sell out fast. They have a 60 day money back guarantee too. Two full months. That’s longer than it took me to feel the difference. If nothing changes, you get every penny back, no questions asked. But if it works? If by the end of week one you’re falling asleep without the ceiling staring? If by week two the 3am wake ups stop and your Friday number moves for the first time in months? You’ll wish you’d started it the same day as your first shot, before the tank ever ran dry. I know I do. Anyway, I’m linking an article below that explains the magnesium link better than I can. Just take 2 minutes to read it. 👇 https://spnutrition-us.com/pages/advertorial-magnesium