For runners, athletes & active people

Train harder. Recover faster.
Transform your physique.

Whether you want to shed stubborn fat, hold onto hard-earned muscle, or sleep better and recover quicker — Zesst gives you the clear guidance you need to reach your goal. Know your targets, see the gap after every meal, and finally get rewarded for all of your training efforts.

Let's do this — try Zesst

Personalised diet programming in 2 minutes. No credit card required.

Built for the everyday high-mileage runner and hybrid athlete who wants simple diet and meal planning, not clunky apps.

Zesst nutrition tracking
✅

On track today

1,820 / 2,100 kcal

Today's run logged

12km · 850 kcal burned

↑ Targets adjusted

Sound familiar?

Your training is only as good as your fuel.

The results you're chasing — a leaner body, better sleep, faster recovery, clearer skin, stronger performance — are all downstream of one thing: eating the right amount for what your body is actually doing.

🪞

Body composition

Still soft despite all those sessions?

When your body isn't getting enough fuel, it holds onto fat as a survival response — especially around your hips, thighs and midsection. Eating more of the right things, at the right time, is often what finally shifts it.

💪

Muscle & strength

Running is quietly eating your muscle.

High-mileage and hybrid training burns through muscle when you're not fuelling enough. If you're lifting and running but not seeing the results — you're almost certainly in a deeper deficit than you think.

✨

Look & feel great

Want to lean out without living on salads?

Not a crash diet. Not obsessive counting. Just knowing your actual targets and consistently hitting them. That's when body composition, energy and confidence finally start shifting together.

😴

Recovery & sleep

Exhausted even after 8 hours of sleep?

Wired but tired. Sleeping long but waking foggy. For active people, these are almost always a fuelling problem — not a willpower or stress problem. Fix the food, fix the recovery.

🌙

Hormones & mood

Feeling flat, hormones all over the place?

Hormones, cycle regularity, cortisol, and mood are deeply tied to how consistently you fuel your body. Chronic under-eating disrupts far more than just your energy — it affects everything.

🌿

Gut & skin

Bloated, inflamed, skin just not glowing?

Your gut and skin reflect how well you're nourishing your body. When training load is high and intake is low, inflammation shows up — in your gut, your joints, and your complexion.

🏁

Performance

Your training deserves to actually pay off.

Properly fuelled athletes run faster, lift heavier and sustain higher volumes without breaking down. If your sessions feel harder than they should — nutrition is almost always the first thing to check.

🤷

Clarity

You train consistently. You just don't know if you're eating enough.

You eat reasonably well and train hard — but you've never actually known your real targets. That uncertainty is exactly what Zesst solves, in under 2 minutes.

All of these come back to one number you probably don't know yet.

Let's do this — try Zesst

No credit card · Takes 2 minutes

Does this sound familiar?

You're doing everything right.
And it's still not working.

Most active people aren't struggling because of effort. They're struggling because they don't have the right information.

🪞

You're putting in the work, but not seeing the changes

Training consistently, eating reasonably well — yet your body isn't shifting the way it should. That stubborn fat isn't budging, and muscle definition just isn't showing. The culprit is usually hidden in the numbers.

💪

Your muscle gains are disappearing when you run

You lift hard. You want to keep your strength. But the moment you add serious mileage, your muscles start shrinking. You're eating enough to feel fine, but not enough to build while you're training.

😴

You sleep 8 hours and still feel wired and exhausted

Sluggish afternoons. You can't recover between sessions. Sleep should help, but you're not bouncing back. For active people, this almost always comes down to one thing: chronic under-fuelling.

🌿

Bloated, inflamed, or your skin just isn't glowing

When training load is high and intake is low, inflammation shows up — in your gut, your joints, your skin. Your body is working overtime without the fuel to recover and repair.

Zesst gives you the clarity you've been missing. Here's how →

Simple process

Up and running in
3 steps

No complex setup. No learning curve. Just start and you'll know where you stand.

01

No more guesswork

Tell Zesst your body stats, activity level, and goal. Know down to the single calorie how much fuel your long runs actually required — and protect your recovery window.

No more guesswork
02

Photo-to-fuel in 2 seconds

Take a photo of your plate. Zesst decodes the macros instantly. No barcode scanning, no gram-weighing, no database searching. Zero friction — so you actually do it every meal.

Photo-to-fuel in 2 seconds
03

Protect your hard work

A real-time fuel gauge shows your calorie gap before your body starts breaking down muscle. See exactly where you stand after every meal — not at the end of the week when it's too late.

Protect your hard work

Why Zesst

What you actually feel
when nutrition clicks

Not features. Outcomes. The things you notice every single day.

Energy that lasts all day
⚡

Energy that lasts all day

No afternoon crash. No dragging yourself to evening sessions. Most athletes under-fuel by 1,000+ calories a day without knowing it. Fix the gap and feel the difference within days.

Recover faster between sessions
💪

Recover faster between sessions

Soreness, fatigue, and stalled progress are almost always nutrition problems first. Hit your targets and feel the difference in your next session — and the one after that.

Protect your hard work
✅

Protect your hard work

A real-time fuel gauge shows your calorie gap before your body starts breaking down muscle. Know if you're on track after every meal — not at the end of the week when it's too late.

Optional but powerful

Tools that make
consistency effortless

These features support your routine — but they're not required to see results.

Results come from knowing your targets and logging honestly. These tools just make that easier to sustain.

Weekly meal planning

Weekly meal planning

Plan your meals around your weekly schedule so you always know what to eat to hit your targets. Optional — but it removes a lot of daily decision fatigue.

Smart grocery lists

Smart grocery lists

Auto-generated from your meal plan. Arrive at the supermarket knowing exactly what to grab — no food wasted, no forgotten items.

Personal recipe library

Personal recipe library

Save recipes from a photo, a URL, or browse what others are making. Log them in one tap once saved — no re-entering every time.

Why I Built Zesst

I was training harder than ever.
And unknowingly destroying my results.

The training was going well

I'd been building my running consistently — hitting 60–70km weeks, completing marathons, improving every race. On paper, everything looked good.

Race results

Christchurch Marathon3:06 · 4:25/km
Queenstown Marathon3:12 · 4:32/km
Dunedin Marathon3:28 · 4:55/km
Wales Marathon (540m vert)3:55 · 5:34/km

Monthly km — Jul 2025 → Mar 2026

JulAugSepOctNovDecJanFebMar085170255340

340 km in March 2026 — peak training month

Garmin marathon race predictor — Jul 2025 → Apr 2026

JulAugSepOctNovDecJanFebMarApr4:10/km4:25/km4:40/km5:05/km

4:57 → 4:10 /km — pace improvement over 9 months

But something was off

I was constantly tired. Sleep was poor. Recovery was slow. My body composition wasn't shifting despite the high training load. I thought I was eating well — whole foods, nothing obvious.

What I didn't know: my target was 3,800 kcal — I was eating ~2,600. A gap that compounded to an 8,400 calorie hole by Sunday, every single week.

That's your body cannibalising muscle, not burning fat — undoing every hard session and kilometre you ran.

Once I fixed it, everything changed

Within weeks of eating to my actual targets, energy improved, sleep got better, and body composition started shifting. Performance followed.

The frustrating part? The fix was simple. I just needed to know the gap existed.

The result — a massive cellular rebound

Body fat 12% → 9.5% in 3 weeks — same total weight

My chronically starved muscles instantly soaked up depleted glycogen and water stores. Lean mass surged on the DEXA scan — not magical new muscle, but the adaptation from months of hard miles I'd already put in, finally being unlocked.

✓

Sleep improved dramatically

✓

Recovery got faster

✓

Energy levels up immediately

✓

Hard sessions finally paying off

DEXA scan — body composition change

March 2026May 20266070809010093.6kg93.9kg70.1kg80.9kg
  • Weight
  • Lean Muscle

"I built Zesst because I couldn't find a simple tool that told me: are you eating enough for what you're doing? Everything else was too complicated, too generic, or focused on the wrong thing. Zesst is what I wish I'd had."

Founder

Will, Founder

Marathon runner & nutrition obsessive

Got questions?

Frequently asked
questions

Stop guessing. Start knowing.

The results you're chasing
are all downstream
of one number.

A leaner body. Better sleep. Faster recovery. Clearer skin. Stronger performance. They all come back to eating the right amount for what your body is actually doing. Zesst calculates your targets in minutes and shows you the gap after every meal.

Let's do this — try Zesst

No credit card required · Takes 2 minutes · Cancel anytime