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Ziva Health › Conditions › Weight Management

Your weight tells
a story. Isabella helps
you understand it.

Whether you're working toward a healthier weight or managing obesity alongside your care team, Ziva connects your smart scale, DEXA scan data, nutrition, sleep, exercise, and lab results - and shows you exactly what's moving the number. Then Isabella helps you do something about it.

Used by people managing overweight and obesity alongside their care team.

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🔒 HIPAA compliant ⚖ Smart scale + app ✦ Free to start
Isabella · Your 30-day weight trend
183.8
4 weeks ago · 196.2 lbToday · 183.8 lb
Weight
183.8 lb
↓ 12.4 lb
Body fat
31.2%
↓ 1.9%
BMI
29.4
↓ from 31.2
Isabella · Today's insight
"You're down 12.4 lb over 4 weeks — excellent progress. Today's reading is slightly up from yesterday, but that's water retention from last night's late dinner, not fat. Your trend is clear and moving in the right direction. Keep today's meals on plan."
New to Ziva?

Ziva Health is an AI-powered health companion for managing weight through daily tracking and personalised coaching. Isabella is Ziva's AI coach - she reads your scale every morning, connects your weight to your food, sleep, and activity, and guides your daily habits to help you make steady, lasting progress.

How Ziva works

Three steps to understanding what's actually driving your weight.

⚖️
01
Step on your scale each morning
Your Ziva RPM scale logs weight automatically each morning. Body composition from a compatible smart scale or DEXA scan, plus your daily hydration log, complete the picture.
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02
Log meals, sleep & activity
Log what you eat, how you slept, and how much you moved. Isabella connects these to your scale readings and shows you the pattern - not just the number.
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03
Get coached on what actually matters
Isabella coaches your meals, activity, and sleep every day - and explains why the scale did what it did this morning, so you stop guessing and start progressing.
Start tracking for free →
1–2 lb
Per week - the sustainable rate that preserves muscle and lasts
RPM scale
Daily weight from your Ziva scale - body composition from DEXA or a compatible smart scale
Daily
Isabella coaching on food, sleep, activity & habits - every single day
Trend
What matters - daily fluctuations are normal; Isabella shows you what's real
What drives your weight

Four things move
the scale every day.

Most people focus only on food. But sleep, activity, and stress move your weight just as powerfully - often explaining why the scale goes the wrong way even when you ate perfectly. Isabella tracks all four simultaneously and shows you what's real versus what's noise.

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Nutrition
A calorie surplus over time drives fat gain. But what you eat, when, and in what combination also affects hunger hormones - ghrelin and leptin - that make adherence easy or nearly impossible.
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Activity & NEAT
Formal exercise matters, but so does NEAT - Non-Exercise Activity Thermogenesis. Daily steps, standing, and incidental movement can account for 15–50% of your total calorie burn.
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Sleep
Poor sleep raises ghrelin (the hunger hormone) and lowers leptin (fullness). Studies show people consume ~385 extra calories the day after a poor night. Isabella tracks the pattern.
😤
Stress & cortisol
Chronic stress elevates cortisol, which promotes fat storage - especially around the abdomen. It also drives cravings for high-calorie foods. Isabella asks about stress when the scale doesn't match your week.
Isabella · What drove your weight this week
Wednesday takeaway (high sodium)+1.8 lb next morning
Thursday gym + evening walk−1.2 lb by Friday
Poor sleep (Mon & Tue, 5.5h avg)+340 kcal eaten Tue
Medication taken consistentlyStable baseline
4-week progress
Week 1 · 196.2 lbWeek 4 · 183.8 lb
↓ 12.4 lb total · 3.1 lb/week avg
Isabella · Weekly summary
"Wednesday's uptick was sodium and water — not fat. You stayed in a calorie deficit all week. Your sleep on Monday and Tuesday drove extra hunger, which is why Tuesday's calories were higher. The gym Thursday made up for it. Net result: good week."
Smart scale

Weight every day.
Body composition tells the full story.

The Ziva RPM scale measures your weight daily - syncing automatically each morning, no manual entry needed. For body composition, Isabella reads data from compatible smart scales (Withings, Tanita, InBody) or imported DEXA scans. Understanding whether you're losing fat or muscle changes everything Isabella coaches you to do.

⚖️ Weight — daily
Ziva RPM Scale
Daily weight with 7-day rolling average. The core RPM signal - syncs automatically every morning, no input needed.
🫀 Body fat & muscle
Compatible scale or DEXA
Are you losing fat or muscle? Preserving muscle while losing fat is the goal - Isabella coaches differently depending on which is happening.
💧 Hydration
Daily self-log in app
A quick daily log. Water retention explains most overnight scale jumps - Isabella shows when a rise is hydration, not fat.
🦴 Bone density
DEXA scan
Tracked via DEXA - especially important where rapid weight loss can affect bone health if protein and activity aren't adequate.
✓7-day rolling average from your RPM scale — see through daily water fluctuations to your real fat-loss trend
✓Body composition from DEXA or a compatible smart scale (Withings, Tanita, InBody) — imported automatically
✓Isabella explains every unexpected reading — high sodium, poor sleep, stress, menstrual cycle, or high-carb day
✓Your care team sees your weight trend, composition changes, and weekly progress report
✓Plateau detection — Isabella flags when your weight has stalled for 10+ days and suggests what to adjust
Isabella · This week's readings
MON
185.8 lb ↓
TUE
184.9 lb ↓
WED
186.2 lb ↑ Na
THU
184.2 lb ↓
FRI
183.8 lb ↓ low
7-day average 184.9 lb
Isabella · Wednesday explained
"Wednesday's 1.3 lb jump was the takeaway — high sodium causes your body to retain water overnight. By Thursday it cleared. Your real trend this week is down 2 lb. That's fat loss, not water."
Body fat
31.2%
via smart scale
↓ 1.9%
Muscle mass
118.4 lb
→ preserved
Hydration
54%
✓ Good
Isabella · Nutrition — today
Breakfast · 7:45am
340 kcal
Greek yoghurt, berries, handful of walnuts
Isabella: High-protein start - this combination keeps ghrelin low for 3–4 hours. Good choice.
Lunch · 1:00pm
520 kcal
Grilled chicken salad, olive oil dressing, sourdough slice
Isabella: 860 kcal logged, 640 remaining. You're on track for the day.
Dinner suggestion · Tonight
With 640 kcal remaining, Isabella suggests: baked salmon, roasted broccoli, and a small portion of sweet potato. High protein, good fats, moderate carbs - supports overnight recovery and tomorrow's scale reading.
Calories logged
860
of 1,500 target
Protein
68g
✓ On target
Remaining
640
for dinner
Nutrition coaching

Every meal is a signal.
Isabella connects food to the scale.

Generic weight loss advice tells you to "eat less." Isabella tells you that last Tuesday's late dinner - 900 kcal after 9pm - is showing up as Wednesday's scale reading, and that switching to an earlier, lighter dinner would have saved you 1.4 lbs of water by morning. That specificity changes behaviour. Your care team sets your calorie and protein targets - Isabella coaches every meal toward them.

✓Daily calorie and protein target set by your care team — Isabella coaches every meal within it
✓Meal-to-scale correlation — which foods caused the scale to rise and whether it was fat or water
✓Hunger pattern coaching — protein-first and fibre-first meals that keep you full longer
✓Remaining calorie budget shown at midday — dinner isn't a guessing game
✓Restaurant and social eating guidance — navigate any menu without falling off track
Key nutrition principle
Protein is the most satiating macronutrient - and the most important for preserving muscle while losing fat. Hitting your protein target daily is often more impactful than cutting total calories. Isabella coaches this every single meal.
Sleep & recovery

Bad sleep makes you
hungrier the next day. Always.

Sleep deprivation raises ghrelin (hunger hormone) and suppresses leptin (fullness signal) - making you physiologically hungrier and less satisfied by food the following day. Research consistently shows people eat around 385 extra calories after a poor night. Isabella tracks your sleep quality, spots the pattern, and helps you understand why some days are harder than others.

✓Sleep quality tracked nightly — duration, consistency, and how it correlates with next-day hunger and calorie intake
✓Scale fluctuation explained — Isabella tells you when a morning rise is sleep-related water retention, not fat gain
✓Resting heart rate and recovery signals tracked alongside sleep — giving your care team a fuller picture of stress and metabolic load
✓Cortisol coaching — Isabella explains why high-stress weeks stall the scale even when your eating is on point
✓Evening habits — meal timing, screen use, and wind-down routines that protect sleep quality
+385
kcal eaten on avg after a poor sleep night
+1.4 lb
typical water retention after a high-stress, poor-sleep night
7–9h
the sleep range that optimises hunger hormones and fat loss
Isabella · Sleep impact — this week
Tuesday · 7.8 h sleep Good
Calories logged: 1,480 (under target). Morning reading: ↓ 0.8 lb from Monday.
Thursday · 5.5 h sleep Poor
Calories logged: 1,820 (over target). Evening snack added. Morning reading: ↑ 1.2 lb.
Sleep vs next-day calories — 7-day
M
T
W
T
F
Sa
Su
● Under target ● Slightly over ● Over target
Isabella · Sleep insight
"Thursday's extra 340 calories weren't a willpower failure — your body was physiologically hungrier after 5.5 hours of sleep. Ghrelin was elevated. Tonight, aim for 7+ hours and you'll find Saturday's meals much easier to stay on plan."
Exercise & routines

Cardio burns calories.
Strength training changes your metabolism.

Both matter - but differently. Running and cycling burn calories during the session. Weight training builds muscle that raises your resting metabolic rate for 24–48 hours after. Isabella logs both, structures your weekly routine, and shows you the impact in your own scale data.

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Strength training
Muscle · Metabolism · Long-term fat loss

Weight training, bodyweight circuits, resistance bands - each session builds or preserves muscle mass. More muscle raises your resting metabolic rate, meaning you burn more calories at rest all day. During a calorie deficit, strength training is what prevents muscle loss.

→300–500 kcal per 45-min session
→Metabolism elevated 24–48h after (afterburn)
→Scale may rise slightly post-session — muscle water retention, not fat
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Cardio
Calorie burn · Heart health · Endurance

Running, cycling, swimming, HIIT, rowing - cardio delivers high calorie burn per session and strong cardiovascular benefit. HIIT (high-intensity intervals) gives maximum burn in minimum time. Steady-state cardio (long runs, cycling) builds aerobic base and is easier to sustain daily.

→Running: ~400–600 kcal/hour
→Cycling: ~300–500 kcal/hour
→HIIT: ~400–600 kcal in 25–30 min
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Daily walking
Base activity · Steps · Recovery

Walking is the most sustainable daily activity - it doesn't require recovery, can be done every day, and adds meaningfully to your weekly calorie burn. It also aids digestion and improves sleep quality. On rest days between harder sessions, a walk keeps you active without taxing your recovery.

→8,000–10,000 steps = ~300–400 kcal
→Post-meal walk improves blood sugar and digestion
→Can be done every day, including rest days
Isabella · Your weekly routine
MON
Strength training
Upper body · 45 min
380 kcal ✓
TUE
Walk / active rest
Recovery day
~310 kcal ✓
WED
Run
5 km · 38 min
420 kcal ✓
THU
Walk / active rest
Recovery day
~290 kcal ✓
FRI
Strength training
Lower body · today
~360 kcal →
SAT
Long walk or cycle
Active rest · optional
~400 kcal –
Weekly active calories (so far) 1,400 kcal
Isabella · Scale note
"Wednesday's scale was up 1.1 lb after Tuesday's rest day — that's post-run muscle inflammation and water, not fat. It'll clear by Saturday. Your weekly calorie deficit is solid: 3 sessions logged, 1,400 kcal burned. Keep Friday's session."
Exercise-to-scale this month
Week 1 · 3 sessionsWeek 4 · 3 sessions
Consistent exercise → ↓ 12.4 lb fat, muscle preserved
How Isabella coaches exercise

A weekly routine,
built around your life and goals.

Isabella doesn't just log your workouts - she structures them. Two or three strength sessions per week, cardio on alternate days, walking as your daily baseline. She explains why the scale might go up after a hard session (muscle inflammation, not fat), shows you the week-to-week trend, and adjusts your coaching when your routine changes.

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2–3 strength sessions/week
Preserves muscle during a deficit. Each session elevates metabolism for 24–48h. Isabella logs sets, tracks consistency, and alerts you if you haven't trained in 5+ days.
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2–3 cardio sessions/week
Running, cycling, swimming, or HIIT on alternate days. Isabella shows you the direct calorie burn and how cardio weeks correlate with faster weight trend drops.
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8,000–10,000 steps daily
Your daily baseline - sustainable every day, including rest days. Post-meal walks specifically aid digestion and improve overnight scale readings.
✓Scale goes up after gym? Isabella explains — muscle inflammation, water retention, not fat gain
✓Protein timing coached — hitting your protein target especially on strength days preserves muscle
✓Weekly exercise targets set by your care team — Isabella tracks consistency and surfaces it in your provider report
Daily routine

Isabella builds a weight routine
around your life, not the other way.

The structure is consistent - weigh in, eat thoughtfully, move through your day, sleep well. Within that structure, Isabella adapts to what you ate yesterday, how your scale responded, and what your care team has set as your targets.

Your weight management daily routine
Weight focus
7:00 AM
⚖️
Morning weigh-in
Step on the Ziva scale before eating or drinking - it syncs automatically. Isabella logs your weight, body fat, hydration and muscle mass, and explains what the number means versus yesterday's reading.
7:30 AM
🥗
High-protein breakfast
Isabella suggests options within your morning calorie budget - prioritising protein and fibre first. A strong breakfast reduces ghrelin for the rest of the morning and makes lunch easier to control.
12:30 PM
💡
Midday calorie check
Isabella shows how many calories you've had and how many remain for the afternoon and dinner. No guessing, no guilt - just the information to make a good decision at lunch and dinner.
1:00 PM
🚶
Post-lunch walk — 15 min
A short walk after lunch burns calories, blunts the post-meal energy dip, and adds meaningful NEAT to your day. Isabella reminds you and tracks it toward your daily step goal.
6:30 PM
🍽️
Dinner — earlier is better
Isabella suggests a dinner that fits your remaining calorie budget. Eating earlier in the evening reduces overnight water retention and makes tomorrow's scale reading more accurate.
7:00 PM
🚶
Evening walk — 20 min
An evening walk closes your step goal, adds to your NEAT burn, and helps regulate blood sugar after dinner. Isabella shows you the weekly impact in your trend line.
9:30 PM
😴
Wind-down & sleep
Isabella checks in on stress and sleep readiness. Good sleep is your most powerful weight management tool - 7–9 hours protects hunger hormones, recovery, and tomorrow's scale reading.
1–2 lb per week is the goal. Slower is safer.
Losing weight faster than 2 lb/week typically means losing muscle alongside fat - which lowers your metabolism and makes keeping weight off harder. Ziva's programme is designed for steady fat loss with muscle preservation, guided daily by Isabella.
What daily tracking achieves
Sustainable weight loss rate1–2 lb/week
Extra calories from poor sleep~385 kcal/day
NEAT share of daily calorie burn15–50%
Protein target impact on satietyStrongest macronutrient
Based on published clinical evidence. Results vary individually.
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Smart scale ships to you. DEXA scan results, labs, and nutrition all feed the same coaching engine.
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The evidence

Why daily tracking works for weight.

The relationship between daily self-monitoring, behavioural change, and weight outcomes is well established. This is what the research shows.

2×
Daily weighers lose more
Studies consistently find that people who weigh themselves daily lose approximately twice as much weight over 6–12 months as those who weigh in weekly or less. Daily feedback creates real-time accountability and faster course correction.
385
Extra kcal after poor sleep
A landmark study in the European Journal of Clinical Nutrition found that sleep-deprived participants consumed an average of 385 extra calories the following day - primarily from fat and salty foods driven by elevated ghrelin levels.
500
kcal deficit = 1 lb/week
A sustained 500 calorie daily deficit produces approximately 1 lb of fat loss per week. Isabella tracks your deficit every day - from food logged, activity burned, and NEAT - and shows you whether you're on track for the week.
Work with your care team

Your care team should
see what you see.

Whether your doctor or dietitian already uses Ziva or is hearing about it for the first time - there are two things you can do right now. Both help you get better care.

Care team not on Ziva yet?
Send them a link. When your provider joins Ziva, they see your daily weight trend, body composition, nutrition log, sleep quality, and activity - and can remotely set your calorie and protein targets without an extra appointment.
Refer Ziva to my care team
Already seeing your provider?
Bring your Ziva 30-day report - weight trend, body composition, nutrition log, sleep quality, activity, and medication adherence. Your doctor can review it in 2 minutes and make more informed decisions about your plan.
Bring my data to my appointment →
Ziva Provider Report
30-day weight summary · Generated by Isabella
PDF ready
Weight change
↓ 12.4 lb
over 30 days
Body fat change
↓ 1.9%
fat loss, muscle preserved
Current BMI 29.4 ↓ from 31.2
Avg daily calorie intake 1,480 kcal ✓ on target
Avg sleep duration 6.8h below 7h target
Avg daily steps 8,640 ↑ from 6,200
Medication adherence 91% ✓ Good
Isabella · Summary for provider
"Excellent 30-day progress - 12.4 lb lost, body fat down 1.9%, muscle mass preserved. Calorie intake consistently on target. Sleep averaging 6.8h - improving but below ideal; sleep coaching in progress. Steps have increased significantly. Medication adherence good. Consider reviewing sleep as the primary lever for the next 30 days."
Why it's hard — and what actually helps

Managing your weight is hard.
Not because you're not trying hard enough.

Weight is influenced by far more than what you eat. Hormones, sleep, stress, genetics, medications, and your food environment all play powerful roles - many of them invisible. Understanding what's actually driving your weight on any given day, and what to do about it, is what makes the difference between struggling alone and making steady, lasting progress.

Why managing weight is genuinely difficult

  • →Hunger hormones work against you — ghrelin (hunger) rises and leptin (fullness) falls during a calorie deficit, making you physiologically hungrier the more you try to eat less
  • →Poor sleep amplifies hunger — even one bad night raises ghrelin and lowers leptin, driving ~385 extra calories the next day regardless of your intentions
  • →Stress triggers fat storage — chronic stress raises cortisol, which promotes fat storage especially around the abdomen, and drives cravings for high-calorie foods
  • →Metabolism adapts — as you lose weight, your body reduces energy expenditure to compensate, which is why progress slows even when you're doing everything right
  • →The scale misleads — daily weight fluctuates by 1–4 lb from water, sodium, carbs, and hormones. Judging progress day-to-day leads to discouragement that causes people to quit
  • →Genetics and medications matter — individual variation in metabolism, appetite, and fat distribution is real; some medications also affect weight. Your care team can help you navigate both

What the evidence says actually works

  • ✓Daily self-weighing — people who weigh themselves daily lose approximately twice as much weight over 6–12 months, because daily feedback drives faster course correction
  • ✓High protein intake — the most satiating macronutrient, and critical for preserving muscle mass during a calorie deficit. Hitting your protein target is often more impactful than cutting calories further
  • ✓Strength training 2–3×/week — preserves muscle while losing fat, raises resting metabolism, and is one of the best predictors of long-term weight maintenance
  • ✓Consistent sleep (7–9h) — protects hunger hormones, supports recovery from exercise, and reduces stress-driven cravings
  • ✓Sustainable rate of loss (1–2 lb/week) — faster loss typically means losing muscle alongside fat, lowering metabolism and making weight regain almost inevitable
How Ziva puts this into practice
Isabella monitors your weight trend, body composition, nutrition, exercise, sleep, and stress every day - connecting them so you understand not just what the scale says, but why, and what to do about it. No labels. No judgement. Just your data and a daily plan.
On this page
Your sustainable target
1–2 lb/week · 500 kcal deficit/day · Protein target met · 7–9h sleep · 8,000–10,000 steps daily - these five habits, tracked daily, drive lasting change.
Common questions

What people ask.

Ziva Health is a wellness and health-coaching app. It is not a medical device and does not diagnose, treat, or prescribe. Always consult a qualified healthcare professional for medical decisions about your weight management, especially if you have obesity-related health conditions or are considering medical interventions.

Isabella AI

Track your weight.
Isabella explains
what's driving it.

Smart scale, nutrition app, sleep tracking, and activity - all connected. Isabella shows you the pattern and coaches your daily habits toward steady, lasting progress.

Free to start · Scale ships to you · HIPAA compliant

Start for freeShare with my care team →