Is this too much food?

Well I'm loosing weight, not starving myself but eating better portions, excersising etc and its working, well today I had a lot more food than I should have and I'm wondering of this amount is a huge set back, I ate 4 pretzel rolls with crazy, a granolabar with peanutbutter, gushers, fruit snacks, a piece of watermelon that was 2 bites and a small, 50¢ coin sized tin of tuna with crackers, I know its not a healthy amount (all the carbs) but is it a bigger problem then I think?
Is this too much food?
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