Three things shaped today’s numbers
Blitz Fueling Check
What your body needs today is not what it needed last week.
Your body. Your goal. Your training today. Blitz reads the signals you enter here and builds a fueling check for this day, grounded in the same science system behind the full app.
Get today’s fueling target, the minimum to protect, and the reason behind both.
350+ peer-reviewed papers
8 safety signals monitored
iOS · Launching summer 2026
Takes about 2 minutes. Result shown now and emailed to you.
01 Your day
Your body, goal, cycle context, and session set the first read.
02 Fuel Match
Today’s fueling, checked against today’s training.
03 Trace
Tap a number to see the reason and the evidence behind it.
This is a public fueling check, not the full daily plan. Blitz gets sharper when it can see meals, sleep, wearables, timing, symptoms, and history.
About you
About you
These details calibrate every number in your plan.
Date of birth
Age changes energy needs, protein targets, and safety thresholds.
Sex
Used for the first energy equation and sex-specific fueling rules.
Height
Used with weight and age to estimate resting energy needs.
Weight
Used for g/kg protein, carbohydrate, hydration, and fuel-floor calculations.
Body composition
Do you know your recent body-fat percentage? Optional. It improves precision, but Blitz can start from height and weight.
Body-fat percentage
%
Source
Goal
Your goal
Blitz tunes the plan around this.
Goal right now
Pick the closest match for this fueling check.
Your day
Your typical day
Outside of training, how active are you?
Outside training, which sounds most like today?
Cycle context
What are your periods doing now?
This tells Blitz whether cycle timing should shape your first plan.
Period pattern right now
What are your periods doing now?
Contraception
Any contraception Blitz should account for?
Cycle tracking
Do you want to track your cycle in Blitz?
When you track your cycle, your nutrition adjusts to each phase - more fuel when you need it, recovery support when it matters.
Cycle phase today optional
Blitz can still build the check without cycle context.
Training · today
Your training
Primary sport drives fuel mix and timing.
Duration
min
Intensity
Where is the session in your day?
A rough position is enough for this check. Exact times and logged meals make the full app sharper.
Blitz Fueling Brief
Here is what Blitz sees for you today.
—
0
kcal for today
P0 g
C0 g
F0 g
What to do with this today
—
Why Blitz exists
Most apps see your weight. Blitz sees your week.
Your body does not need the same nutrition plan every day.
A hard training day, poor sleep, a long meal gap, your cycle phase, perimenopause, age, recovery, and wearable signals can all change what your body needs.
Most apps miss that.
Blitz does not just give you a calorie target.
It reads the context behind the number.
It adjusts for:
Your training: what you did, when you did it, and what recovery demands next.
Your hormones: cycle phase, contraception, perimenopause, menopause, and HRT.
Your age: because protein and recovery needs change after 35 and again after 50.
Your wearable data: without blindly trusting every device equally.
Your meal timing: because daily totals do not show whether you were under-fuelled for half the day.
Your consistency: so your targets build progressively instead of overwhelming you on day one.
Your own baseline: not a generic population average.
That is the Blitz difference.
Most nutrition apps tell you what to eat.
Blitz shows you why your body needs it today.