I love fish. I was drooling when I saw numerous kinds of fish at the Tsukiji fish market. I would be satisfied eating fish sushi everyday but doing so would leave a big dent in my wallet.

Also, I am happy with my weight but would be even happier if I lose 2kg. I heard Japanese diet is a good way to achieve it.

Any recommendations for an inexpensive Japanese diet? (without veggies as I dislike veggies)

I agree :) I eat yoshinoya's gyudon about once a week. Over here (Shanghai, China) a large bowl costs around 300yen. I always finish the beef but eat no more than half the rice. Expensive by local standards but it's within my budget.

any weight-loss diet needs to include lots of veggies, by definition. they are the only things that will make you feel full when you are eating the number of calories needed to lose weight- otherwise you will be hungry all the time. most sushi fish is actually quite fatty.
if you only need to lose 2 kilos, why not just up the amount of exercise you are doing? same effect, no need to change eating patterns (although yours could do with changing, I'm afraid...)

True, I ate veggies almost everyday for 2 months to lose 2kg earlier this year. I really wanted to be under 50kg so I was willing to suffer for it. Now that I am under 50kg, I am not willing to suffer anymore. Not desperate to lose 1-2kg but would be glad to.

The more I exercise, the hungrier I get, hence I tend to eat more, which cancels out the effect.

Anyway yeah your diet is terrible and you need to start eating some vegetables. Meat is expensive in Japan. The only cheap meat is chicken and even that will get expensive. Learn to like veges or learn to pay through the roof for meat. You don't have much choice.

Near 1,000 calories is perfect for my dinner as I don't each much all day. Typically:

Breakfast: None
Lunch: 400-600calories
Dinner: 800-1000calories
Soft drinks/snacks: 100-300calories

So I still eat around 1600 calories/day despite a heavy dinner (I usually sleep no earlier than 2am that's why)

I know my diet isn't healthy but I am not planning to worry till I am 30 :) . What I consider most important in my 20s is that my BMI stays in the 18-19 range.

cycling for an hour each day or running for 30 minutes will burn off 400 calories more more which over a week will basically make you drop 1kg or more of body fat.

I often want to eat more vegetables, but I have a lot of trouble finding Japanese dishes that have a decent amount. Whether I'm eating out, or buying something at the supermarket... tempura, soba, sushi, donburi... I always just have to cook something for myself.

The only real veggie-friendly dishes I can think of are nabe and tsukemono, unless you count those huge mounds of tasteless raw cabbage you get with tonkatsu, hahaha...

I always just have to cook something for myself.

Of course! That's how Japanese diet works! You buy the vegetables at the shop and then prepare them at home yourself. Is it not the same in your country?

The range of pre-made vegetable dishes available at super markets is limited.

It is never too early to change your habits, and the earlier you do it, the easier it is. Once you reach 30 you are starting to get set in your ways to some extent.

The only time I eat plenty of veggies high in iron is during blood loss every month. I typically eat red spinach during that time. I can be good for a few days a month but can't be eating like that everyday!

Once I reached my late 20s it became noticeably harder for me to keep slim, although, I manage it.

I am aware that people (esp women) easily gain weight with age. So I wanna enjoy without gaining weight while I still can afford it at this age.

If you want to keep your figure well into your 40s and 50s, start now.

I wanna keep my figure in my 20s. In my 30s, 40s and 50s (I don't really think about being those ages yet) I am not sure... I probably wouldn't mind being a bit fatter as most others also gain weight anyway. However, Japanese women seem like the exception. My host (157cm) is in her late fifties & weighs 44kg! I am so envious.

i don't really get the weight/stats obsession some people have. i just eat relatively healthily and exercise moderately and i still weigh what i did at 20- about 57 kg (i am 174 cm tall).

That's what a lot of my around age 20 Japanese friends said because (according to them) if their waists exceed 69cm, it would be really hard to find fashionable clothes. They felt "no matter how good your diet is, if you can't maintain a waist 69cm or under, you will have a hard time looking good."

I am somewhat scared of wrinkles. I have seen people under 25 with fine lines.

I'd say from when I was there that on average Japanese people aren't overweight because of all the walking and biking more than what they eat. None of the people from my work cooked for themselves and for the most part ate a lot of crap. I'm not so sure how healthy they eat; all I saw was tons of rice and noodles and a severe lack of fruits and vegetables. When we went out to restaurants for work functions the food was pretty disgusting. Sushi is good once and a while, but I don't think it's healthy as a regular part of a diet.

Being on a diet doesn't mean you don't eat a lot; it means you a careful about what you eat. Staying active is very important, so if you can start walking everywhere as much as possible, that's almost all you need.

For food, eating a lot of fish is a good choice; I do this too. Cooking at home instead of buying take out is always the best choice because you know what you putting into your food. There's tons of different kinds of fish to eat, and takes probably 20 - 30 minutes at the most to cook.

Any good diet should have several servings of fruits and vegetables. Having fruit for breakfast is a great choice.