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Link_knight30 said:

Hi, I am a certified personal trainer. I respect every field specially the more technicals.

However, as far as I know it is not healty to drop more than certain weight per week (please google parameters), in other words is not sustainable because your body has an specific metabolism and some results maybe temporary.

There are a tons of quality foods but you don't have necessary buy all from certain brands or places. 

The following is almost applicable to every person: there is a mathematic way to lose or gain weight, not applicable for some medical conditions or deficiency of minerals.

Just calculate your daily calorie requirements (basal), There are a few calculators on internet that can help.

For example if the result is 2,000 calories daily just consume 200-500 less calories than you need. That would approx 1,500 per day. You will start to lose weight in a healthy way, just eat balance (protein, carbs and lipids) and you will be fine.

Do not do that for a long time cause your body needs the fuel (food) to work well. Just rest eventually from the hypocaloric (deficit of calories) diet.

Results slow down but that is just normal due to less fat and sometimes muscleloss so when a body doesnt need to carry around all that weight it will start using less energy/needing less calories,but this difference is not that huge and ofcourse at the start of weightloss a body can lose a lot of water but that shouldnt really be counted because that is something fluctuating.

Fatloss is what is most important when we talk about diets and that mostly stays pretty consistent when you manage to keep the same calorie deficient.

As far as i know it is healthy do drop as much calories as you can while being able to take in the nutrients you need,you can easily drop to a + 1000 calorie deficit a day without being unhealthy but it needs a far more stricter shedule when thinking about what you still CAN eat.

The mental part is always the hardest one and what you are suggesting is the diet that is easiest to manage but with drastic weightloss the diet is just the first step,afterwards everyone needs to find a certain healthy lifestyle to their own comfort so they do not lose all the progress made.