Keto Diet and Weight Loss: What to Know on Mounjaro or Wegovy

A ketogenic diet typically limits carbohydrate intake to a low daily threshold — often cited in nutrition literature as under 50 g per day — shifting the body's primary fuel source toward fat and producing ketones. For people on GLP-1 medicines like Wegovy (semaglutide) or Mounjaro (tirzepatide), who already tend to eat less due to reduced appetite and food noise, a high-protein, low-carb pattern can feel manageable precisely because portions are naturally smaller.

Why protein matters here

One practical priority on any reduced-calorie plan — including a ketogenic diet — is maintaining adequate protein intake. Protein helps preserve lean muscle mass during weight loss, and many people find high-protein meals sit well with them even when overall appetite is low. Common keto-friendly protein sources include eggs, fish, chicken, Greek yogurt, tofu, and cheese. If you follow a plant-based or meatless approach to weight loss, it is absolutely possible to eat low-carb with foods like tempeh, edamame, nuts, and seeds — though it does take a little more planning.

Things to be aware of

Starting a ketogenic diet can come with an adjustment period — sometimes called the "keto flu" — involving fatigue and headaches in the first week or two as the body adapts. This can overlap with side effects that are also commonly reported on GLP-1 medicines, so it is worth keeping a record of how you feel. Some people also find that very low carbohydrate intake affects energy levels during exercise; a more moderate low-carb approach may suit those who find strict keto difficult to sustain. For a broader look at how overall energy balance fits in, the guide to eating at a calorie deficit is a useful companion. If you prefer to avoid gluten as well, there is plenty of overlap with a gluten-free way of eating — many keto foods are naturally gluten-free.

General educational note: the best dietary pattern is one you can maintain consistently. There is no single "best diet for weight loss" that works universally — individual factors, preferences, and medical history all play a role. Always check in with your prescriber or doctor before making significant changes to how you eat, especially if you have existing health conditions.

Keeping on top of nutrition while eating keto — tracking protein, calories, and carbs — is where a purpose-built tool makes a real difference. GLP Trackr's AI photo scan lets you point your camera at a meal and get an instant breakdown of calories, protein, and macros without manual entry. On days when appetite is low and meals are small, that speed and simplicity matters.

Beyond food logging, you can set specific targets for protein, calories, and daily fibre, so you can see at a glance whether your keto meals are hitting the nutritional marks that support your journey. The app also includes a meal plan library built around GLP-1-friendly, higher-protein options — handy when you want ideas that fit a low-carb pattern without having to research from scratch.

If you notice changes in energy or mood as you adjust your diet, GLP Trackr's daily check-in makes it simple to log those observations over time. Spotting patterns — like which eating days correlate with better energy or weight movement — is far easier with a running log than trying to recall it at your next prescriber appointment.

GLP Trackr does not give nutritional prescriptions or replace the advice of your healthcare professional. It helps you record what you eat and how you feel, so those conversations with your prescriber are better informed.

Give it a try — download GLP Trackr on the App Store or Google Play and start a free 7-day trial to see how effortless food tracking can be on a keto or low-carb plan.