Hubby and I have been on a program designed for people with osteoarthritis, diabetes and heart problems.
It is an 18 week program.
In the first 6 weeks breakfast and lunch are replaced by shakes - I chose a milkshake for breakfast and soup for lunch.
The evening is portion controlled - lean protein and carbohydrate each take up 1/4 of the dinner plate and are not piled high.
The other half of the plate can be piled high with free vegetables - steamed or salads.
Snacks to control hunger can be any amount of free vegetables of some very limited fruits - mostly berries - strawberries, blueberries, rasperries,
On this stage of the program I lost 4 kg in 4 weeks even though I could hardly move out of my chair due to advanced arthritis in my hip.
Then I went into hospital for a full hip replacement so I had to interrupt the program. I've picked it up since.
The second stage is similar to the first six weeks except that the midday shake is replaced with a normal lunch - a sandwich or a salad. In this stage you can eat a bit more carbohydrate - roughly equal to 3 slices of bread. Snacks can include a wider range of fruits. Exercise is encouraged in the form of walking.
During 6 of weeks at stage 2 I've lost 3.3 kilos.
The last 6 weeks allow you to substitute occasional meals with a shake but basically you are attempting to develop healthy eating habits through careful selection of food groups and portion control. Today I had a shake for breakfast, and for lunch a bowl of salad with some cold turkey meat. Snacks have been some wafer biscuits with low fat cheese. Tonight I will have more turkey (I bought a couple of turkey shanks on special recently) with some mashed potato and steamed carrots, baby peas and corn on the cob. I've had no bread today so if I'm hungry before going to bed I will have a slice of toast spread with fresh avocado and salt and pepper.
The best thing about this program is that it is medically approved and in our case supported by our health fund so we don't have to pay anything. There is also online and telephone support to help us understand the program and to talk over problems and difficulties.
This link will show you a bit about the program. The menu on the LHS gives details.
http://oa.hwfl.com.au/
You may be able to find something similar where you live.