1. Short title This Act may be cited as the Food Security Improvement Act of 2018 . 2. Calculation of supplemental nutrition assistance program benefits using cost of low-cost food plan The Food and Nutrition Act of 2008 ( 7 U.S.C. 2011 et seq.) is amended— (1) in section 3 ( 7 U.S.C. 2012 ) by inserting after subsection (l) the following: (l–A) Low-cost food plan means the cost of the diet determined by the Secretary, as described in The Low-Cost, Moderate-Cost, and Liberal Food Plans, 2007 , published by the Center for Nutrition Policy and Promotion (CNPP–20, November 2007) of the Department of Agriculture. The cost of such diet shall be the basis for uniform allotments for all households regardless of their actual composition, except that the Secretary shall— (1) make household-size adjustments (based on the unrounded cost of such diet) taking into account economies of scale; (2) make cost adjustments in the low-cost food plan for Hawaii and the urban and rural parts of Alaska to reflect the cost of food in Hawaii and urban and rural Alaska; (3) make cost adjustments in the separate low-cost food plans for Guam, and the Virgin Islands of the United States, to reflect the cost of food in those States, but not to exceed the cost of food in the 50 States and the District of Columbia; and (4) on October 1, 2019, and each October 1 thereafter, adjust the cost of the diet to reflect the cost of the diet in the preceding June, and round the result to the nearest lower dollar increment for each household size. ; (2) in section 8(a) ( 7 U.S.C. 2017(a) ) by striking thrifty food plan each place it appears, and inserting low-cost food plan ; and (3) in section 19(a)(2)(A) ( 7 U.S.C. 2028(a)(2)(A) )— (A) in clause (i) by striking and at the end; (B) in clause (ii)— (i) by striking each fiscal year thereafter and inserting each of the fiscal years 2004 through 2018 ; and (ii) by striking the period at the end and inserting a semicolon; and (C) by adding at the end the following: (iii) for fiscal year 2019, $2,191,000,000