A study conducted by Greenfield H, Smith AM,  and Wills RB, published in “Human nutrition.  

Applied Nutrition” on 1984 , provides  valuable insights into this topic. 

The research involved 2,241 Australian adults  who consumed main meals at a cafeteria. 

The salt shakers, both single-holed  and multi-holed (with 5, 9, 13 holes),  

were weighed before and after use. The findings  revealed that for all hole numbers, salt usage  

increased linearly with an increase in hole area. Interestingly, for a given hole area,  

multi-holed shakers resulted in decreased  salt use compared to single-holed shakers.  

This suggests that multi-holed shakers offer  consumers better control over salt dispensing. 

I mean, accidentally putting too much salt  into your food is the worst of both worlds,  

cuz then you would not only ingest too  much sodium but also would not enjoy it.