Olive Oil and Weight Loss: When to Take It and What the Evidence Says

Extra virgin olive oil is rich in monounsaturated fats and polyphenols. Research suggests that fat consumed at the start of a meal can slow gastric emptying slightly and trigger satiety hormones — which may complement the appetite-reducing effects many people already experience on tirzepatide or semaglutide. Some people choose to take a small amount of olive oil before a meal for this reason, while others simply use it as their primary cooking fat or salad dressing.

Is there really a "best time"?

There is no robust clinical evidence pinpointing one optimal moment to consume olive oil for weight loss. The commonly circulated idea of drinking it first thing in the morning or immediately before a meal is largely anecdotal. What does have broader nutritional backing is replacing less-healthy fats with olive oil consistently across the day — rather than adding it on top of an otherwise unchanged diet.

What about castor oil?

Castor oil is sometimes mentioned alongside olive oil in weight-loss discussions, but the two are very different. Castor oil is a laxative and is not recommended as a weight-management tool; any use of it for that purpose should be discussed with your prescriber or doctor first. This page focuses on extra virgin olive oil as a dietary fat.

Practical ways to include olive oil on a GLP-1 journey

• Drizzle over protein-first meals — a small amount over grilled fish, eggs, or vegetables adds flavour and healthy fat without large calorie additions.
• Use as your primary cooking fat — swapping saturated fats for olive oil is consistent with general healthy-eating guidance.
• Add to a light breakfast — for example, on wholegrain toast with eggs; pairing fat with protein may help you feel satisfied longer on a reduced appetite.
• Avoid large quantities — olive oil is calorie-dense (roughly 120 kcal per tablespoon); on a GLP-1 journey where overall intake is often lower, portions still count.

If you are thinking about how olive oil fits into your wider calorie picture, understanding your daily calorie deficit and energy balance is a useful starting point. You might also explore a structured meal plan approach to support weight loss or ideas for a healthy breakfast that works on a GLP-1 journey.

One of the trickiest parts of including olive oil in your daily eating is that calorie-dense foods are easy to underestimate, especially when appetite changes make portions feel less intuitive. GLP Trackr's AI photo-scan food logging lets you photograph a meal and get an instant breakdown of calories, protein, and fat — no manual measuring required. That makes it far easier to see how a drizzle of olive oil actually fits into your day.

Beyond individual meals, the app's meal plans and recipe library are built around GLP-1-friendly eating — higher protein, gentler on the stomach, and designed for the smaller appetite that often comes with tirzepatide or semaglutide. You can also set a personal daily calorie and protein target and watch how your food choices stack up in real time. For more ideas on foods that complement this approach, take a look at meal substitutes that can support weight loss.

Keeping a consistent food log also gives you something concrete to bring to prescriber appointments — a clear picture of your eating patterns alongside your weight and progress data.

Ready to take the guesswork out of healthy-fat tracking? Download GLP Trackr on the App Store or Google Play and start a free 7-day trial — just snap a photo of your next meal and let the app do the rest.