FTX founder Sam Bankman-Fried can’t adequately prepare for trial in six weeks while in jail without proper access to computers, necessary medications to help him concentrate, and a better diet than bread, water and peanut butter, his lawyers told a magistrate judge Tuesday.

The lawyers made their complaints at a Manhattan federal court hearing after Mr. Bankman-Fried pleaded not guilty to seven charges he’ll face at his October 3 trial, including wire fraud and multiple conspiracy counts.

Mr. Bankman-Fried was extradited from the Bahamas in December after prosecutors said he stole billions of dollars in FTX customer deposits, spending tens of millions on his businesses, speculative venture investments, charitable donations, and on illegal campaign contributions aimed at influencing cryptocurrency regulation at Washington.

The 31-year-old California man was making his first court appearance in a drab beige prison uniform since his $250 million bail was revoked 10 days ago by Judge Lewis A. Kaplan. The judge had granted a request by prosecutors to jail him after agreeing that the fallen cryptocurrency whiz had repeatedly tried to influence witnesses against him.

Magistrate Judge Sarah Netburn, presiding over Tuesday’s hearing, told Mr. Bankman-Fried’s attorneys that she would not overrule Mr. Kaplan’s rulings about access to computers, but that she would see if she could get the Metropolitan Detention Center in Brooklyn to provide medications and a diet more closely aligned to the defendant’s vegan preferences.

Attorney Mark Cohen told Judge Netburn that Mr. Bankman-Fried hadn’t received medication that’s necessary for him to focus since he was sent to jail on August 12.

He said his client continued to be served a “flesh diet,” leaving him to rely solely on bread, water and sometimes peanut butter.

“Your Honor, that’s outrageous and needs to be remedied,” he said of a man who had shuffled into the courtroom, his legs shackled.

Another defense attorney, Christian Everdell, told Judge Netburn that Mr. Bankman-Fried was being denied the right to adequately prepare for trial because he was only allowed to review millions of pages of evidence two days a week.

“There is no way for him to effectively prepare for his defense,” Mr. Everdell said.

Before his bail was revoked, Mr. Bankman-Fried had been permitted to live with his parents at their Palo Alto, California, home with strict rules limiting his access to electronic devices.

Judge Kaplan ordered him jailed after concluding that there was probable cause to believe he had committed the federal crime of attempted witness tampering.

He cited an attempt by Mr. Bankman-Fried to communicate with the FTX general counsel in January and his disclosure several weeks ago to a journalist of some private writings by Caroline Ellison, his former girlfriend and the ex-chief executive of Alameda Research, a cryptocurrency trading hedge fund that was one of his businesses.

The judge said the writings were kinds of things that a former romantic partner was unlikely to share with anyone “except to hurt, discredit, and frighten the subject of the material.”

Mr. Bankman-Fried’s crypto-currency exchange,” the BBC reported, “grew to be the second largest in the world and a titan of the industry,” with $10 billion to $15 billion traded every day, earning him the moniker the “king of crypto” in his heyday.

Associated Press