Thank you for using Justanswer for your concern.
This would more likely indicate low fluid intake, rather than be related to food.
If you have any other symptoms or illnesses let me know and we could narrow it down further.
Also, let me verify exactly what you mean by dizziness because it can mean different things to different people, and there actually is one true meaning.
Vertigo is a feeling of the room moving or spinning and even a feeling of floating
Balance difficulty is a difficulty staying balanced with falls sometimes happening
Weakness is self explanatory
True dizziness is a lightheadedness or the feeling you are about to faint. Because you used both of those words, this is probably what you mean.
True dizziness can be caused by ear conditions, brain conditions, cardiovascular problems, anemia, and hypoglycemia.
Since you don't report other symptoms, I will explain the problem of dehydration (which fits under cardiovascular).
If you have dehydration you would likely be thirsty, have a dry mouth or tongue, fatigue, and darker than usual urine.
If tend to drink things like sodas and coffee instead of water, you can still become dehydrated due to the caffeine (a diuretic) and salt in those drinks.
Let me know what you think and if you have other symptoms. I can show you a list of other possibilities if this does not fit.