Just curious, are you consuming any carbo-related food products? IMHO, they are one of the culprits responsible for weight gain, especially if you are a non-active person.
Yeah, you cut down on your food intake but how about your snacks or beverages? Are you one of those who must have their Coke or 4 cups of coffee everyday? Do you have the tendency to buy Snicker bars as a mid-afternoon snack?
My record was losing 2kgs in 5 to 7 days - yes it's possible. Why do you think Hollywood actresses like Catherine Zeta-Jones can regain their fantastic figure after giving birth in such a short time? The Atkins diet really works, but what those actresses are doing isn't exactly healthy.
I have oatmeal with milk in the morning, green salad with tuna for lunch, and boiled chicken thighs with asparagus in the evening. If you must have your carbo, limit yourself just a tiny-itty-bit every alternate day. Just a suggestion - if you don't mind having raw greens, try raw capsicums. They worked miracles for me. Because they are related to the chilli family and I was informed chilli can reduce your weight. I like the taste but it may not work for everyone.
Try taking your tuna oil supplements every alternate day instead. Perhaps you can replace with other supplements like Ginko Biloba instead? I drink milk too but now, I drink more soya milk instead.
Yeah, what I'm having sounds like rabbit food but that's the price you gotta pay, especially you wanna look good and you are not an active person. Think of it as a detox procedure.
Btw, don't skip your meals, especially breakfast because you will have the tendency to gorge the following meal.