Cronometer

What Cronometer is

Cronometer is a food and nutrient tracking app that logs meals against a detailed nutrient database — not just calories, but protein, fiber, and dozens of individual vitamins and minerals. It's more granular than most mainstream calorie-counting apps, which is exactly what makes it useful for GLP-1 treatment specifically.

Why it's relevant on a GLP-1

As covered in our guide on protein, fat, and carbohydrates, research consistently finds that people on GLP-1 medications tend to fall short on protein and fiber while overconsuming saturated fat — largely because appetite suppression shrinks total intake so much that hitting specific nutrient targets within that smaller volume becomes genuinely difficult to track by feel alone. A tool that shows exactly where you stand against a protein target (commonly 1.2–1.6 g/kg/day) or a fiber goal, rather than just a calorie count, directly addresses that gap.

How it's typically used

1. Set personalized targets. Cronometer lets you set specific daily targets for protein, fiber, and individual micronutrients — worth setting these based on the targets discussed with your prescriber or dietitian (see our discussion guide on talking to a dietitian or trainer) rather than the app's generic defaults.
2. Log meals as you go. Like most food trackers, entries can be added via search, barcode scan, or saved recipes/meals — useful for building a repeatable routine around the smaller number of meals appetite suppression tends to leave you eating.
3. Review the micronutrient breakdown, not just calories or macros. This is Cronometer's main differentiator — a single dashboard view showing where you stand on vitamins and minerals (vitamin D, B12, iron, magnesium, potassium, and others) that are easy to under-consume when overall intake is significantly reduced.
4. Track trends over time, useful for correlating nutrient intake with symptoms — for example, checking whether a low-fiber stretch lines up with a bout of constipation, or whether inadequate protein intake correlates with a period of low energy (see our guide on fatigue during titration).

Benefits specific to GLP-1 users

• Makes an invisible problem visible. Falling short on protein or fiber isn't something most people can feel directly day to day — a tracked, numeric view is often the only way to notice the gap before it shows up as a symptom.
• Supports body composition goals. Precise protein tracking is one of the two key inputs (alongside resistance training) in achieving body recomposition rather than just weight loss.
• Reduces guesswork during a period of low appetite. When you can only comfortably eat a small amount, knowing exactly what that small amount is providing helps you prioritize the highest-value foods rather than guessing.
• Useful data to bring to appointments. A logged history of intake can be a concrete, specific thing to review with a prescriber or dietitian, rather than trying to recall a general sense of how eating has been going.

A caution worth naming

Detailed nutrient tracking is a genuinely useful tool for many people, but it can also become a source of anxiety or rigidity around food for others — worth being mindful of, particularly if you have any history of disordered eating (see our guide on anxiety around eating or body image emerging during treatment). If tracking starts to feel compulsive rather than informative, that's worth raising with a provider directly rather than pushing through.

The bottom line

Cronometer's detailed protein, fiber, and micronutrient tracking directly addresses the specific nutritional gaps research has found to be common during GLP-1 treatment — most useful as a tool for making an otherwise invisible shortfall visible, not as a rigid daily requirement.