I’ve been eating too much lately, so my food expenses are high. To save money, I bring a rice ball for lunch—but when I get home, I still end up eating more. I'm gaining weight, and I want to stop as soon as possible. Or for a more casual tone, you could say: These days I eat too much, so my food costs are pretty high. I bring a rice ball for lunch to save money, but when I get home, I keep snacking. I'm gaining weight and really want to stop soon.

I've been eating too much these days, so I spend a lot on food/groceries. Although I only bring a rice ball for lunch, I'll eat something as soon as I get home. I’m gaining weight and I want to stop as soon as possible.

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