calcSupply.js

function calcSupply(age, maxAge, food, foodPerDay){
    var ageF = age;
    var maxAgeF = maxAge;
    var foodF = food;
    var foodPerDayF = foodPerDay;
    var year = 365;
    var yearsAhead = maxAgeF - ageF;
    var daysAhead = yearsAhead * year;
    var totalFood = daysAhead*foodPerDay;
    console.log(totalFood +"kg of "+ foodF+ " would be enough until I am "+maxAgeF+" years old.");
}

calcSupply(38,118,"chocolate",0.5);
calcSupply(20,87,"fruits",2);
calcSupply(16,102,"nuts",1.1);