Hey everybody so I used to be a little overweight, I was a UK size 12 and it was creeping up, i felt lethargic and not very good about myself so I decided something had to be done about it. I didnt go on any FAD diet or only eat a carrot a day, but I did a little bit of research and created some rules for myself and it worked 
Rule 1- 40 mins of cardio a day-not a pleasant stroll something which gets ure heart racing and sweat dripping, I did JM shred + skipping or I went for a run or I went to the gym. Mix it up, its more fun that way.
Rule 2- If it doesnt have a mother or grow from the ground I cant eat it ( I avoided potatoes and rice though)
Rule 3- I would only allow myself 2 teaspoons of oil in my cooking a day
Rule 4- eat slowly, to ensure I did i ate everything with a tea spoon and every bite i put my spoon down and chewed 12 times, this sounds funny but no one noticed
Rule 5- Never take seconds
Rule 6- Eat in small plates
Rule 7- 8 glasses of water a day
and it worked
An example of what I ate :
Breakfast- 2 Eggs- best is to poach, sometimes scrambled or an omlette but it used up my oil allowance 
or I would make a honey and walnut milkshake with semi skimmed milk
I used a glass full of semi skimmed milk, handful of walnuts and tea spoon of honey and a bunch of ice and put it all in a blender and i drank is slowwwlllyyyy and i stayed full for agess!
Lunch-salads of all kinds, if i was feeling hungry I filled myself up on cucumbers and peppers
Dinner- today I ate tandoori chicken- I dont use any oil in the marinade, i just spray my oven tray will oil- the marinade is from yoghurt, salt, pepper, chilli powder, garlic, garam masala and corriander power. I ate it will mixed grilled veges
I also make lots of grilled fish with dry rubs/seasoning and things like salmon have enough of their own natural oil so again you dont need to add any.
Snacks- cucumber, carrots, peppers, nuts
Soups are great too IMO as long as you dont add too much salt or oil
trying to have more and more fruits when hungry, filling and low in calories 
Losing 30 kilograms in 8 weeks is not possible even if someone has constant diarrhea. 