I'll look at the bills tonight and see if the prohibited foods are enumerated.
The entire text of that bill:
83R2910 JSL-D 
     By: Canales    H.B. No. 523       
A BILL TO BE ENTITLED     
AN ACT
     relating to prohibiting the purchase of energy drinks under the
     supplemental nutrition assistance program.
            BE IT ENACTED BY THE LEGISLATURE OF THE STATE OF TEXAS:
            SECTION 1.  Subchapter A, Chapter 33, Human Resources Code,
     is amended by adding Section 33.036 to read as follows:
            Sec. 33.036.  PURCHASE OF ENERGY DRINKS PROHIBITED UNDER
     SUPPLEMENTAL NUTRITION ASSISTANCE PROGRAM. (a) In this section,
     "energy drink" means a beverage containing at least 65 milligrams
     of caffeine per 8 fluid ounces that is advertised as being
     specifically designed to provide metabolic stimulation or an
     increase to the consumer's mental or physical energy. The term does
     not include coffee or any substantially coffee-based beverage.
            (b)  A recipient may not use supplemental nutrition
     assistance benefits to purchase an energy drink.
            (c)  The department shall conduct a public outreach campaign
     to promote awareness of the prohibition under this section.
            SECTION 2.  If before implementing any provision of this Act
     a state agency determines that authorization from a federal agency
     is necessary for implementation of that provision, the agency
     affected by the provision shall request the authorization and may
     delay implementing that provision until the authorization is
     granted.
            SECTION 3.  This Act takes effect September 1, 2013.