// Mifflin-St Jeor equation for Basal Metabolic Rate
// Most accurate BMR formula validated by research (Mifflin et al., 1990)
//
// Males:   BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(years) - 5
// Females: BMR = 10 * weight(kg) + 6.25 * height(cm) - 5 * age(years) + 161

export function calculateBmr(weightKg, heightCm, age, sex) {
  const base = 10 * weightKg + 6.25 * heightCm - 5 * age;
  return Math.round(sex === "m" ? base - 5 : base + 161);
}

export function getAge(birthYear) {
  return new Date().getFullYear() - birthYear;
}