Suggestions please

Any suggestions on diet aids? My brother in-law has been struggling with his diet. He is starting a diet and desperately need to lose weight! He used to take some diet pills which his doctor prescribed to him and it worked wonderful. But after few weeks of taking he need to stop since he’s now at a prehypertension stage. One of our friendly neighbor told him that boiling orange peels and drinking it as a tea would burn fat but he’s a little skeptical about that. It sounds kinda strange! Any suggestions?