Forty-six-year-old Gavin Wren tried to avoid his favorite snacks like Oreos, ice cream and a can of Pringles for 30 days. But the experiment left him with anxiety. Forty-six-year-old Gavin Wren tried to avoid his favorite snacks like Oreos, ice cream and a can of Pringles for 30 days. But the experiment left him with anxiety.