Focused fat loss.

Deliberate design choice. The app’s structure is loosely inspired by PSMF (Protein-Sparing Modified Fast), where the core principle is: protect muscle with protein, let the deficit do the work. You don’t need to run a PSMF to benefit from that logic.

If your calories are right and your protein is right, carbs and fat will sort themselves out — they’re just the remaining calories split however you prefer.

Protein is the only macro that earns its own tracking because it does things the others don’t: it preserves muscle in a deficit, and it keeps you very full.

Tracking all three macros is a chore that adds a lot of friction without proportionate benefits for most people. It’s complexity theater.

The simpler the logging, the faster the logging. The faster the logging, the more likely you do it. The more likely you do it, the more it works.

However, if macro splits really matter to you, feel free to note them in your food log descriptions.

KYD doesn’t have a dedicated exercise calorie field because most people WILL overestimate calories burned during training — sometimes by 2–3x — and baking that into your deficit creates a false sense of headroom that stalls progress.

Your steps already capture the bulk of your non-resting energy expenditure, which for most people is the bigger lever anyway.

That said, if you’re an advanced athlete confident in your numbers, you can log a negative calorie entry in your food log with your training session name to offset it.

It’s there if you need it; we just don’t want to encourage the myth that you can just train your way into a deficit.

KYD has three modes: deficit, maintenance, and surplus.

The core mechanic is the same — see your calories in, see your calories out, see the gap. Which direction you want that gap to go is up to you.

In maintenance mode, the app tracks how close you are to your TDEE rather than how far below it.

In surplus mode, it tracks whether you’re hitting your target overshoot for a lean bulk.

The protein tracking matters even more if you’re gaining — you can’t build muscle without the building blocks, and most people in a surplus still undereat protein because they’re filling up on easy calories.

The name says “deficit” but the skill is the same: know your numbers, notice the patterns, adjust. Whether you’re cutting, maintaining, or building, that’s the game.