Hi there..., thank you for sharing your essay here. Without further ado, let me give some valuable feedback.
It is always good to leave one space every time you write a new paragraph. This makes your writing easy to read. More importantly, you are more likely to control how many words are written in a paragraph.
The chart displays prices alterations for fresh food and vegetables, sugars, and sweet, and carbonat drinks from 1978 to 2009.
This is a good intro, but it seems that this sentence are very similar to the the original one, and therefore this will deduct your score. I think you'd better switch it into the passive one. Here it is: A clear comparison of how the prices of fresh fruits and vegetables, sugar and sweets, and carbonated drinks change during the period in question is presented in the line graph.
fresh fruits and vegetables increase
An significant increase was seen in the price of fresh fruits and vegetables
fresh fruits and vegetables dramatically increase almost catch up 350.
The figure for the price of fresh fruits and vegetables increased dramatically and virtually reached a peak of 350%
I strongly suggest reading sample answers as many as you can. This helps you improve your grammar, vocabulary and ideas related to IELTS essays. Hope this helps :D
A heap of luck