I was in this group years ago (around 2001) when I lost approx 1.5 kg/
week
(3.3 pounds/week) for about 3 months to lose 20 kg.

That time I was doing exercise and weights during much of the time.

After 7 years, I climbed back up to my original weight (about 100kg)
and
so it was time to do it again.

This time I decided to do it without exercise, unless you count
walking
to the station to go to work.

I found that in the last 7 years there is even better chicken. I got
one
that is 132 calories for 22.1g protein. This is packaged food so it's
easy to be sure you've got the maths correct.

According to a website, even the top end of the protein requirement
for me was 67g. I was able to get that with 3 pieces of chicken per
day, for a total of about 400 calories. With my BMR initially listed
as around 2000 calories, I had a 1600 calorie deficit and was thus
looking at 1.6 kg/week loss (about 3.5 pounds/week).

So my staple diet was 3 pieces of chicken, as much diet lemonade
as I wanted so that I could feel that I was getting my sugar fix, even
though it was fake. Diet lemonade is virtually 0 calories. And a
vitamin
tablet (also 0 calories) to cover all the vitamins I would be missing
out on with such a diet.

The results were in line with expectations.

I was 99.1kg on 2008-12-27 and on 2009-02-15 I was 87.8kg.
That's almost exactly 1.6 kg/week.

Eating chicken is monotonous for sure, but there's no way to claim
being hungry. If I was hungry, I could have eaten more chicken. I
could have eaten 15 chickens per day and still had a slight calorie
deficit.

I didn't 100% stick to that. Probably every second day on average,
one of the meals was replaced with something else, for various
reasons.

Some of those reasons were experimental - I wanted to try fish,
and I wanted to try boiled eggs (just the egg white). And sometimes
I felt like having cereal for breakfast like I would normally do.

In addition, because I couldn't be bothered to take food to work, 8
hours was too long to go without food, so I ate some of the lollies
(candy/sweets) that they supply there. That probably boosted it
by 100-200 calories/day on average, but was presumably compensated
for by the walking to/from the station.

From the US government website I downloaded a spreadsheet to find
out if there were better things than chicken as far as protein per
calorie were concerned. I added that formula to their spreadsheet
and sorted by that, and found things like crab were better, and
egg whites too. And from another source, I found that kangaroo
was even better still.

If I was the kind of person to cook, I would have done it like this:

breakfast = chicken (132 cals/22.1g protein)
lunch = 6 egg whites (120 cals/25.2g protein)
dinner = kangaroo (98 cals/22g protein)
total = 350 calories, 69.3g protein

to get a bit of variety (and eggs are easy to take to work in a
container, thus avoiding the unnecessary eating of lollies).

And while I don't mind pure lemonade, perhaps others would
prefer diet lemonade and diet coke (and I think other things
come in diet form too) for variety.

I didn't notice any side-effects besides my pants falling
down without a belt.

One thing of interest is how cheap this can be if you just eat
egg-whites. About 16 eggs/day required to get 67g protein.
That costs approx US$15/week (in Australia). And once again,
with eggs, you can never claim to be hungry. I would have had
to stuff myself with 100 egg whites before exceeding my BMR.
I'd like to see a really fat person try to put on weight eating as
many egg-whites as they wanted.

Now that I'm below 88 kg and not very fat, I will be varying my
food with things like takeaway which are more difficult to get
accurate calorie numbers for, and eat the rice that comes with
it, so not really on a genuine VLCD so no more dramatic
results. But I'm planning as a matter of course to skip rice
etc if that is an option (ie without wasting food or money),
and check with the scales that I'm still set up with a deficit.

BFN. Paul.