Cosmopolitan seeking views on protein bars

Cosmopolitan UK are looking for a dietician or nutritionist to comment on protein bars, e.g. 

• which are best in terms of lowest sugar content vs highest amount of protein?
• when is best to consume a protein bar?
• what are polyols — are they really an amazing alternative to sugar?
• what do ‘polyols’ do for the body and how do they work?

Deadline is fairly tight!