I've built nutrition tracking apps. I've used nutrition tracking apps. And here's the uncomfortable truth I kept running into: I couldn't stick with any of them for more than a week.
It wasn't the nutrition knowledge that was missing. I know what a calorie deficit is. I know how to count macros. I know protein matters. The problem was always the same: I'd forget to log, or I'd be at a restaurant and couldn't be bothered to search a database for "grilled chicken Caesar salad no croutons dressing on the side," or I'd just stare at the app icon on my phone and feel nothing but dread.
So 30 days ago, I tried something different. I stopped using a tracking app entirely and started tracking my food through WhatsApp instead. This is what happened.
The Problem With Traditional Food Tracking
Let me be specific about why every tracking app I tried eventually ended up in my "deleted" pile. It wasn't one big thing — it was death by a thousand tiny frictions:
- The app is never already open. You eat lunch. You need to log it. That means unlocking your phone, finding the app, opening it, waiting for it to load, then starting the search. By the time you're in, the moment has passed and you're already doing something else. You tell yourself you'll log it later. You don't.
- Database search is painful. Type "chicken." Get 847 results. Chicken breast, grilled. Chicken breast, raw. Chicken breast, frozen, Tyson brand, 4oz serving. Chicken breast, generic, USDA entry. Which one? You pick the one that seems close enough and move on, knowing it's probably wrong.
- Portions are a guessing game. "1 cup of rice." Was it really 1 cup? Did you measure it? Of course not. You eyeballed it. It was probably 1.5 cups. Now your numbers are 50% off and you don't even know it.
- It feels like homework. This is the big one. Every meal becomes an obligation. Breakfast should be enjoyable. Dinner with friends should be fun. Instead, there's this nagging feeling that you need to "do your logging" — and that feeling slowly poisons your relationship with food.
I tracked my consistency across my last four attempts with traditional apps. Day 1: always logged everything. Day 2-3: logged most meals, skipped snacks. Day 4-5: logged breakfast, forgot lunch. Day 6-7: opened the app once, felt overwhelmed by the gap, gave up. Average streak: 3.2 days.
The WhatsApp Experiment
The idea behind Sunn came from a simple observation: I open WhatsApp probably 50 times a day. I text friends without thinking about it. I send photos constantly. There's zero friction in any of that — it's just part of my day.
What if tracking food felt like that? Not like opening a specialized app, but like texting a friend who happens to know nutrition?
So I built it. And for 30 days, every meal I ate was logged by sending a WhatsApp message or photo. Here's what the experience actually looked like.
What a Typical Day Looked Like
7:30 AM — Breakfast
Me:
"2 eggs scrambled, toast with butter, coffee with oat milk"
Sunn:
"Logged! That's about 420 cal, 22g protein, 28g carbs, 24g fat. Good protein start — you're at 22/140g for the day."
12:45 PM — Lunch (photo)
Me:
[Photo of a poke bowl from a lunch spot]
Sunn:
"Nice poke bowl! I see salmon, rice, edamame, avocado, seaweed salad, and what looks like spicy mayo. Estimated: 680 cal, 38g protein, 65g carbs, 28g fat. Running total: 1,100 cal, 60g protein. You're on track."
3:30 PM — Snack
Me:
"apple and handful of almonds"
Sunn:
"Good call — 250 cal, 7g protein. You're at 67g protein with dinner to go. You'll want about 70-75g at dinner to hit your target. Chicken, fish, or tofu would close the gap perfectly."
7:15 PM — Dinner (photo)
Me:
[Photo of grilled chicken, roasted vegetables, and rice]
Sunn:
"Looks great. Grilled chicken breast, roasted broccoli and peppers, and rice. About 580 cal, 45g protein. Daily total: 1,930 cal, 112g protein, 195g carbs, 72g fat. You're slightly under your calorie target and protein is solid. Well done."
Total time spent tracking that day: maybe 90 seconds. No searching. No scanning barcodes. No arguing with a database. Just texting.
What Surprised Me Most
1. I actually did it for 30 days straight
This was the biggest surprise. My previous record with any food tracking method was maybe 11 days, and that was with intense motivation at the start of a new year. With WhatsApp tracking, I hit 30 days without a single missed day. Not because I was more disciplined — because I never had to make the conscious decision to "go track my food." I was already in WhatsApp. I was already sending messages. Logging a meal was just another message in my existing flow.
2. Photo tracking changed everything
About 60% of my logs were photos, 40% were text. Photos removed the single biggest friction point in traditional tracking: figuring out what you ate and how much. I didn't need to describe "about 6 ounces of grilled chicken with what I think was a cup of mixed vegetables and some kind of grain." I just snapped a photo. The AI identified everything on the plate and estimated portions visually.
Was it perfect? No. There were times the portions were off by 10-20%. But here's the thing: imperfect tracking you actually do beats perfect tracking you abandon on day 4. The consistency of 30 days of approximate data was infinitely more useful than 3 days of obsessively weighed and measured entries.
3. The coaching part matters more than the numbers
With a traditional app, you log your food and see numbers. Calories remaining: 847. Protein: 68/140g. Cool. Now what? The app doesn't tell you. It just shows you a red or green number and hopes you figure it out.
With Sunn, the conversation was different. At 3 PM, when I logged my snack, it told me I needed 70-75g of protein at dinner and suggested specific foods. When I had a rough day and went over my calories, it didn't flash red numbers — it said "you're 200 over target, which is nothing in the grand scheme. Tomorrow's a new day." When I strung together 5 days of hitting my macro targets, it noticed and said something about it.
That emotional layer — the encouragement, the practical suggestions, the absence of shame — made a massive difference in whether I wanted to keep going. Numbers alone don't motivate most people. Feeling supported does.
4. I learned more about my eating patterns in 30 days than in years of on-and-off tracking
Because I actually had 30 consecutive days of data, patterns jumped out that I'd never seen before:
- My protein was consistently low at lunch (averaging 18g) and I was compensating at dinner by eating massive portions. Spreading protein more evenly made me less hungry in the afternoon.
- Weekends weren't as bad as I thought. My Saturday and Sunday calories were only about 15% higher than weekdays — not the disaster I'd imagined.
- I was barely eating any vegetables before 6 PM. Once I saw this in the data, I started adding vegetables to lunch and my fiber intake doubled.
- My snacking wasn't the problem. It was the mindless snacking I wasn't logging with traditional apps. When every snack is a quick text message, you capture the handful of nuts, the piece of chocolate, the few bites of your kid's leftover pasta. Those "invisible" calories added up to 200-300 per day.
The Psychology of Why Messaging Beats Apps
After 30 days, I spent a lot of time thinking about why this worked when everything else didn't. It comes down to three things:
1. Zero app-switching friction
Opening a dedicated app is a decision. It requires intention. You have to stop what you're doing, find the app, and mentally shift into "tracking mode." Sending a WhatsApp message is not a decision — it's a reflex. You're already there. There's no mode to shift into. The cognitive cost is basically zero.
2. It feels like talking to someone, not entering data
Typing "had a burrito for lunch, pretty big one" feels fundamentally different from searching "burrito" in a database and selecting "Burrito, bean and cheese, frozen, heated, 1 burrito (142g)." One is human communication. The other is data entry. Humans are wired for communication. We are not wired for data entry.
3. The response creates a feedback loop
When you log food in a traditional app, nothing happens. The numbers update silently. When you text Sunn, you get a response — acknowledgment, a running total, sometimes a suggestion or an encouraging word. That response triggers the same dopamine loop that makes texting addictive in the first place. You send a message, you get a reply, it feels good, you want to do it again. The tracking behavior becomes self-reinforcing instead of self-depleting.
The Results After 30 Days
Let me be honest about what changed and what didn't.
- Consistency: Went from an average of 3.2 days to 30 days straight. This alone was worth the entire experiment.
- Protein intake: Averaged 128g per day over the 30 days, up from what I estimate was 80-90g before (I didn't have reliable data because I never tracked long enough).
- Awareness: I now know, without checking, that my go-to lunch has about 25g of protein and my favorite dinner has about 45g. That mental database is priceless and it only builds through sustained tracking.
- Weight: Lost 3.5 lbs. Not dramatic, but I was eating in a moderate deficit (~350 cal/day), which is sustainable and healthy. The point was never rapid weight loss — it was learning to eat well consistently.
- Relationship with food: Better. Genuinely better. I stopped thinking of meals as "things I need to log" and started thinking of them as "things I'm telling my coach about." It sounds like a small reframe, but it changed how I felt about the entire process.
Who This Is and Isn't For
This approach works best for people who have tried tracking and quit. The ones who know what they should eat but can't stick with the system long enough to see results. If that's you — if the problem was never knowledge but always consistency — then tracking through WhatsApp might be the thing that finally sticks.
It's probably not for competitive bodybuilders who need gram-level accuracy on every macro. The photo-based estimates have a margin of error. For most people trying to eat better, lose weight, or get more protein, that margin is completely fine. For someone prepping for a physique competition, it might not be precise enough.
Want to try it yourself? Take the 60-second quiz to get your personalized calorie and macro targets, then start texting your meals to Sunn on WhatsApp. Here's exactly how it works. The first 7 days are free, and canceling is one tap. No commitment, no guilt.
Common Questions
How accurate is photo-based food tracking?
Roughly 85-90% accurate for calories and macros, based on internal testing. The AI identifies foods well and estimates portions visually. The main source of error is hidden ingredients — a sauce might have more oil than it appears, or a dish might contain sugar you can't see. You can always add a text note like "the chicken was fried, not grilled" to improve accuracy. For most people's goals, 85-90% accuracy with 100% consistency beats 99% accuracy with 10% consistency.
What about privacy? Are my food photos stored?
Your messages are processed to provide nutrition analysis and then the images are not permanently stored on our servers. The nutritional data (calories, macros, meal descriptions) is saved to your account so you can see your history on your dashboard, but the original photos are not retained long-term. WhatsApp messages themselves are end-to-end encrypted by default.
What if I don't have a photo? Can I just type what I ate?
Absolutely. About 40% of my logs during the 30-day experiment were text-only. Just type naturally — "big bowl of pasta with meat sauce and a side salad" or "protein shake, banana, and a handful of trail mix." You don't need to be precise with portions. Sunn will estimate based on typical serving sizes and ask follow-up questions if something is ambiguous. It works just as well as photo tracking for most meals.
Written by Espen Opdahl
Founder of Sunn. Building AI-powered nutrition coaching to make healthy eating simple. Nutrition data sourced from the USDA FoodData Central database.
Medical disclaimer: This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your diet or exercise routine.