Code Editor for app.py

import streamlit as st
import numpy as np

st.title("Weight & Calorie Calculator")

st.write("""
This app helps you calculate your daily caloric needs based on your weight, activity level, and goals.
""")

# User inputs
weight = st.number_input("Enter your weight (kg)", min_value=30.0, max_value=300.0, value=70.0)

activity_level = st.select_slider(
    "Select your activity level",
    options=["Sedentary", "Lightly Active", "Moderately Active", "Very Active", "Extra Active"],
    value="Lightly Active"
)

goal = st.radio(
    "What is your goal?",
    ["Maintain Weight", "Lose Weight", "Gain Weight"]
)

# Activity level multipliers
activity_multipliers = {
    "Sedentary": 1.2,
    "Lightly Active": 1.375,
    "Moderately Active": 1.55,
    "Very Active": 1.725,
    "Extra Active": 1.9
}

# Calculate BMR using Mifflin-St Jeor Equation (simplified version)
bmr = (10 * weight) + 625  # Simplified formula

# Calculate TDEE (Total Daily Energy Expenditure)
tdee = bmr * activity_multipliers[activity_level]

# Adjust calories based on goal
if goal == "Lose Weight":
    recommended_calories = tdee - 500
elif goal == "Gain Weight":
    recommended_calories = tdee + 500
else:
    recommended_calories = tdee

# Display results
st.header("Your Results")

col1, col2, col3 = st.columns(3)

with col1:
    st.metric(
        label="Base Metabolic Rate",
        value=f"{bmr:.0f} cal"
    )

with col2:
    st.metric(
        label="Daily Energy Expenditure",
        value=f"{tdee:.0f} cal"
    )

with col3:
    st.metric(
        label="Recommended Daily Calories",
        value=f"{recommended_calories:.0f} cal",
        delta=f"{recommended_calories - tdee:.0f} cal" if goal != "Maintain Weight" else None
    )

# Additional information
st.subheader("What These Numbers Mean")
st.write("""
- **Base Metabolic Rate (BMR)**: The number of calories your body burns at rest
- **Daily Energy Expenditure (TDEE)**: Total calories burned including activity
- **Recommended Daily Calories**: Adjusted calories based on your goal
""")

st.info("""
Please note: This is a simplified calculation and should be used as a general guide only. 
For more accurate recommendations, consult with a healthcare professional or registered dietitian.
""")