The 39-year-old man, who can't be identified to protect the identities of his sons, lost his custody battle launched by the Children's Aid Society, the Ottawa Citizen reported.
The man weighs 380 pounds and argued unsuccessfully that on his own, he slimmed from 525 pounds since last year with diet and exercise in order to keep his sons, 6 and 7. Both boys are classed as having special needs.
Court heard the father once had two profitable businesses with his estranged wife of three years. One was a lucrative computer business and the other was an illegal marijuana farm. The man acknowledged he was once also a heavy marijuana user himself, but has given it up.
In his ruling, the judge noted neither of the boys showed signs of, or reported any abuse. The judge acknowledged the father "has achieved personal stability," but expressed concern about his ability to maintain it.
"(The father's) weight loss regime is itself a full-time job," the judge ruled. "So is parenting two high-needs children. One will inevitably have to give ground to the other."
The father told the Canadian Broadcasting Corp. he intends to begin a hunger strike to protest the ruling.