Jaime Alvarez-Ocanegra appeals his guilty-plea conviction and sentence for conspiring to distribute heroin and launder money. He makes numerous challenges to his conviction and sentence.

The record indicates that Alvarez-Ocanegra knowingly and voluntarily entered a guilty plea, 1 reserving only the right to challenge “any upward departure pursuant to U.S.S.G. § 5K2.0 from the Guideline range found by the district court,” “waive[d] his right to appeal his sentence on any ground, including any appeal right conferred by 18 U.S.C. § 3742.” See United States v. McKinney, 406 F.3d 744, 746 (5th Cir. 2005); United States v. Robinson, 187 F.3d 516, 517-18 (5th Cir. 1999); Fed.R.Crim.P. 11(b)(1)(N). The Government has invoked the waiver provision. As the district court did not upwardly depart in this case, Alvarez-Ocanegra’s challenges to his sentence are waived under the terms of his plea agreement.

Alvarez-Ocanegra’s argument that the Government withheld evidence in violation of Brady v. Maryland, 373 U.S. 83, 83 S.Ct. 1194, 10 L.Ed.2d 215 (1963), is waived by Alvarez-Ocanegra’s valid guilty plea. See United States v. Lampazianie, 251 F.3d 519, 526 (5th Cir. 2001); United States v. Diaz, 733 F.2d 371, 376 (5th Cir. 1984).

Alvarez-Ocanegra’s argument that the Government violated the treaty under which he was extradited by enhancing his sentence based on a prior conviction also waived. Alvarez-Ocanegra provided neither adequate argument in support of his assertion nor adequate citation to authorities. See Yohey v. Collins, 985 F.2d 222, 225 (5th Cir. 1993) (holding that claims not adequately argued in the body of the brief are deemed waived on appeal).

Alvarez-Ocanegra’s argument that his conviction is invalid because § 841 is unconstitutional in light of Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), is foreclosed by this court’s decision in United States v. Slaughter, 238 F.3d 580, 582 (5th Cir. 2000). Al *536 varez-Ocanegra concedes that his argument is foreclosed. He raises the issue only to preserve it for Supreme Court review.

AFFIRMED.