let’s talk about GLP-1
GLP-1 medications have completely changed the conversation around weight loss, metabolism, and chronic disease, and honestly… that’s not a bad thing. But like most powerful tools, they work best when they’re used with intention, education, and support. Not as a standalone magic fix.
Right now, the most well-known GLP-1s are semaglutide and tirzepatide, with retatrutide coming down the pipeline and currently in trials. Semaglutide works by mimicking GLP-1, a hormone that helps regulate appetite, blood sugar, and satiety. Tirzepatide goes a step further by targeting both GLP-1 and GIP, which can enhance insulin sensitivity and fat loss. Retatrutide is the newest and most aggressive of the group, acting on GLP-1, GIP, and glucagon receptors. Early data suggests it may lead to even more significant weight loss, but with that power comes an even greater need for strategy and protection.
Here’s my honest take. I think GLPs can be a fantastic aid for the right person. They can quiet food noise, improve blood sugar control, reduce inflammation, and create space for people who have felt completely trapped in their bodies. That matters. But they are not a replacement for nutrition or fitness. And when they’re used without those foundations, that’s where we start seeing problems.
One of the biggest concerns I see clinically is muscle loss. This is huge. Muscle is not just about aesthetics. Muscle is metabolically active tissue. It’s what drives your resting metabolic rate, helps regulate blood sugar, protects your bones, and supports longevity. Once you hit your 30s and beyond, muscle loss accelerates naturally if you’re not actively building it. If you layer a GLP on top of that without resistance training and adequate protein, you can lose muscle even faster. And when muscle goes, metabolism slows. That’s how people end up losing weight but feeling weaker, softer, colder, more fatigued, and more inflamed afterward.
Protein is non-negotiable here. I generally want to see my clients eating at least 100 grams per day, often more depending on body size and activity level. Protein is what preserves muscle, supports hair growth, stabilizes blood sugar, and helps with satiety. Low appetite on a GLP doesn’t mean low needs. Your body still requires raw materials to maintain lean tissue. Undereating protein is one of the fastest ways to sabotage long-term results.
Hair loss is another common concern, and it’s usually not the medication itself. It’s the stress of rapid weight loss combined with inadequate protein, low calories, micronutrient deficiencies, and sometimes thyroid dysfunction that was already brewing beneath the surface. GI issues also come up frequently. Nausea, constipation, reflux, and bloating are signals that dosing, food choices, or gut motility need support. These meds slow gastric emptying. That can be helpful, but it also means digestion needs more care, not less.
This is also where the conversation around microdosing becomes really interesting. Not everyone needs or wants dramatic weight loss. For some people, especially those who are close to their goal weight, microdosing GLPs can provide benefits without the extremes. Lower doses can help reduce food noise, improve joint pain, decrease inflammation, stabilize blood sugar, and create a calmer relationship with food. I see this used really beautifully in people who are insulin resistant, dealing with chronic inflammation, or struggling with constant mental chatter around eating, but who still want to train, fuel properly, and build muscle.
Regardless of dosing, my belief is this. If someone is considering starting a GLP, it’s incredibly prudent to look at labs first. These medications can be supportive, but they can also unmask or worsen existing imbalances if you’re not paying attention. I like to keep an eye on fasting insulin, A1C, fasting glucose, thyroid markers, iron and ferritin, B12, vitamin D, liver enzymes, kidney function, inflammatory markers like CRP, and in many cases lipid panels. These markers help tell the story of whether a GLP is likely to support your health or stress it further.
GLPs are not good or bad. They’re tools. Powerful ones. And when they’re paired with strength training, adequate protein, intentional nutrition, and proper monitoring, they can be life-changing in the best way. The goal should never be just weight loss. The goal is metabolic health, muscle preservation, strength, energy, and feeling good in your body long term. And in my opinion, that’s the lens everything should be viewed through.