Hemiptera plant. Phloem sap, which has a higher concentration of sugars and nitrogen, is under positive pressure unlike the more dilute xylem sap. Most of the Sternorrhyncha and a number of Auchenorrhynchan groups feed on phloem. Phloem feeding is common in the Fulgoromorpha, most Cicadellidae and in the Heteroptera. The Typhlocybine Cicadellids specialize in feeding on non-vascular mesophyll tissue of leaves, which is more nutritious than the leaf epidermis. Most Heteroptera also feed on mesophyll tissue where they are more likely to encounter defensive secondary plant metabolites which often leads to the evolution of host specificity. Obligate xylem feeding is a
Sugary drink tax being passed-through to higher soda prices. In August 2016, a UC Berkeley study showed a 21% drop in the drinking of soda and sugary beverages in low-income neighborhoods in its city. A study from 2016 compared the changing intake of sugar sweetened beverages and water in Berkeley versus San Francisco and Oakland (which did not have a sugary drink tax passed) before and after Berkeley passed its sugary drink tax. This analysis showed a 26% decrease of soda consumption in Berkeley and 10% increase in San Francisco and Oakland while water intake increased by 63% in Berkeley and 19% in