I m 28 male how i increse my weight?

Safe or Foolish &Why: Vague question with no details, stated goals or reasons. How about be happy about being apparently slender? - tends to correlate with better long term health. Gaining fat wt. Easier by eating lots of carbs/sugars but unhealthy. Gaining muscle wt. Requires eating real food + repetitively & intensely using & controlling the muscles to be increased in size/performance. Study dietdoctor, attia, etc.