Kay Pajeet, here's what you do.
First, catalog your current weight. You will do this on Saturday morning at 8:00 a.m after you have taken your morning shit before you eat/drink anything. Say its 185 pounds.
Next for the entire week (starting that Saturday morning you weighed yourself), you eat only the things you know for sure what the calories are. It could be a bag of chips/crisps,a can of soda, a chicken sandwhich from Mcdonalds, etc.) If you don't know the exact measurement don't eyeball the portion. (If it says 4 ounces cooked, or 1 cup rice cooked, bring out your measuring utensil and measure it out exactly.) Don't worry about anything else, don't even bother running or working out (we'll get to that later). You will write down, every night, what the calories were for that day.
When the next Saturday morning rolls around, 8:00 a.m after you take your shit, weight yourself. Write down the weight and write down the total number of calories you ate for the week.
Say for example you ate 21,000 calories that week, and your weight did not change at all. That means we know for sure you need to eat 3,000 calories a day in order to maintain your current flabby body (21,000 a week/7 days = 3000 k/cal per day). Now, a pound of fat is 3500 calories. So, if you want to lose fat you need to eat 17,500 calories per week to lose a pound of weight.
So, now that we know exactly how much you need to eat in order to gain/lose/maintain weight, now we get into proper macronutrient balance to maintain/grow muscle. The rule of thumb is .75-1 gram protein per bodyweight in ilbs to build muscle per day (depending on activity level). So, if you weigh 195 pounds, you need to eat 150-195 grams of protein per day in order to increase muscle mass. HOWEVER, and this is a big one, you can only absorb at most, 30-40 grams of protein per meal. So, if you only eat 3 meals a day, you will at most absorb 120-160 grams of protein.
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