in Corona and Lua - why does my memory usage increase to 1.5MB then back down to 800Kb then repeats

I am writing a game in Lua on the Corona platform. Currently it's pretty simple.
I am writing the memory usage to the screen every frame using gcinfo().
Why does my memory usage increase to 1.5MB then back down to 800Kb then repeats?
Is it normal?
jasonbbSoftware EngineerAsked:
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Shaun VermaakTechnical SpecialistCommented:
That sounds perfectly normal to me

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jasonbbSoftware EngineerAuthor Commented:
Also, sometimes it can help if you call collectgarbage() occasionally.
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